Mini Nuke (Fallout 3)

The Mini Nuke is a tactical nuclear warhead designed for use in a shoulder-launched missile weapon. It is used as ammunition for the Fat Man and its unique variants.

Mini-Nukes are the single most expensive piece of ammunition, ranging from 250 to 400 caps a piece to buy, depending on your Barter level. They are also the single most powerful weapon in the game, doing many times more damage than any other weapon even at low Big Guns levels. These are also great decoration for your house or Tenpenny Tower Suite. This is clearly another reference to the Nagasaki Fat Man because it closely resembles the look of it, but smaller.

Hand grenade
A hand grenade version of Mini Nuke also exists, although it can be even more dangerous to the user than the Fat Man version.

Fallout 3

 * Fat Man
 * Experimental MIRV
 * Liberty Prime (a larger version, but less effective)
 * VB-02 Vertibird

Available for Free
There are 59 total, in Fallout 3. Another is included with the Operation Anchorage DLC package and is at the bottom of this list, making for 60 total.

{| class="fallout-table sortable" style="width: 80%" ! width=150 | Closest map marker !! width=70 | Amount !! Description
 * Jalbert Brothers Waste Disposal || 1 || In the eastern Abandoned Shacks laying on the floor next to a Duck and Cover! book
 * Bethesda Ruins || 3 || One in Office West (move some crates on the top floor near a fridge), one in Office East (near the exit to the catwalk), and one in the Underworks (in the storage room under a crate).
 * Broadcast Tower KB5 || 1 || In a truck's trailer to the northwest. The same trailer the scientist gets blown out of.
 * Broadcast Tower KB5 || 1 || Northwest of tower: Abandoned house guarded by raiders, in the bathtub.
 * Broadcast Tower KB5 || 1 || Northeast of abandoned house: In a lone bathtub between a skeleton's legs,
 * Capitol || 3 || On opponents and shelves in the rotunda.
 * Cliffside Cavern || 1 || In the northwestern chamber, on top of a Hard locked safe.
 * Corvega Factory || 1 || In a derelict truck trailer on the road leading south from the factory.
 * Deathclaw Sanctuary || 1 || Near the Endurance Bobblehead, inside, near the entrance.
 * Broadcast Tower KT8 || 1 || In a Drainage Chamber to the northeast.
 * Five Axles Rest Stop || 1 || Among the wrecked vehicles.
 * Fort Bannister || 1 || "Fort Bannister Main", at the top of the stairs in an Average locked room.
 * Fort Constantine || 3 || Bomb Storage: Two in locked room (see You Gotta Shoot 'Em in the Head), one in upstairs office.
 * Fort Independence || 2 || In room containing Miss Launcher.
 * Franklin Metro Utility || 1 || At the end of the water filled tunnel.
 * Friendship Heights || 1 || West of Friendship Heights, in a Super Mutant camp, close to health and ammo boxes.
 * GNR Building Plaza || 8 || Eight Mini Nukes and a Fat Man are on the body of a fallen Brotherhood of Steel soldier.
 * Jury Street Metro Station || 1 || In Gold Ribbon Grocers (see Rube's Gold Ribbon).
 * Grayditch || 1 || In the Ghoul outpost building to the south, in the back room on a shelf.
 * Hallowed Moors Cemetery || 1 || Inside the chapel.
 * Hamilton's Hideaway || 1 || In the weapons cache behind a (key-required; get it from Three Dog) locked cell door.
 * Jocko's Pop & Gas Stop || 1 || In a manhole near the Signal Sierra Victor transmission tower to the southeast.
 * Jury Street Metro Station || 1 || Inside the Calverton church to the southwest.
 * Jury Street Metro Station || 1 || On the corpse of the Behemoth.
 * Georgetown East || 1 || In La Maison Beauregard.
 * L.O.B. Enterprises || 1 || East Wing, on top of light fixture in CEO's bathroom.
 * Meresti Metro Station || 1 || On an inaccessible shelf near a workbench ; shoot with a Sniper Rifle or knock off with a Grenade explosion.
 * Minefield || 1 || The Roach King keeps one behind his throne northeast of the town.
 * National Archives || 1 || Sub-basement, in the generator room behind a Very Hard locked gate.
 * National Guard Depot || 5 || Next to Experimental MIRV.
 * Oasis || 1 || At the bottom of a pool in the caves.
 * Old Olney Sewer || 1 || In a Very Hard locked closet.
 * Vault 92 || 1 || West of the Vault entrance, on the ground inside the Raider Farmhouse.
 * Roosevelt Academy || 1 || Due east of the academy, in the raider's jetty (north of car pile-up).
 * SatCom Array NN-03d || 2 || On the hands of the dummy on top of tower C.
 * SatCom Array NW-05a || 1 || At a wharf to the west.
 * Super Duper Mart || 1 || On a table near a Protectron.
 * Seward Sq. Southeast || 5 || From The Preacher (unmarked mini-quest).
 * Takoma Industrial || 1 || On the corpse of the Behemoth.
 * VAPL-58 Power Station || 1 || In a small "shack" under a large powerline support (also the location of the first Keller Family Transcript) to the north.
 * VAPL-66 Power Station || 1 || On a table next to the left desk.
 * VAPL-84 Power Station || 1 || In a trailer behind the station.
 * Vault 101 || 1 || On a wooden shelf at the back of the barn just northwest of the Vault.
 * Vault 106 || 1 || In the final chamber of the Science Lab level.
 * White House || 3|| At the top of the stairs (outside), near a Fat Man.
 * Outcast Outpost (Operation: Anchorage DLC) || 1 || In the armory after the Anchorage Reclamation simulation has been completed.
 * Jury Street Metro Station || 1 || On the corpse of the Behemoth.
 * Georgetown East || 1 || In La Maison Beauregard.
 * L.O.B. Enterprises || 1 || East Wing, on top of light fixture in CEO's bathroom.
 * Meresti Metro Station || 1 || On an inaccessible shelf near a workbench ; shoot with a Sniper Rifle or knock off with a Grenade explosion.
 * Minefield || 1 || The Roach King keeps one behind his throne northeast of the town.
 * National Archives || 1 || Sub-basement, in the generator room behind a Very Hard locked gate.
 * National Guard Depot || 5 || Next to Experimental MIRV.
 * Oasis || 1 || At the bottom of a pool in the caves.
 * Old Olney Sewer || 1 || In a Very Hard locked closet.
 * Vault 92 || 1 || West of the Vault entrance, on the ground inside the Raider Farmhouse.
 * Roosevelt Academy || 1 || Due east of the academy, in the raider's jetty (north of car pile-up).
 * SatCom Array NN-03d || 2 || On the hands of the dummy on top of tower C.
 * SatCom Array NW-05a || 1 || At a wharf to the west.
 * Super Duper Mart || 1 || On a table near a Protectron.
 * Seward Sq. Southeast || 5 || From The Preacher (unmarked mini-quest).
 * Takoma Industrial || 1 || On the corpse of the Behemoth.
 * VAPL-58 Power Station || 1 || In a small "shack" under a large powerline support (also the location of the first Keller Family Transcript) to the north.
 * VAPL-66 Power Station || 1 || On a table next to the left desk.
 * VAPL-84 Power Station || 1 || In a trailer behind the station.
 * Vault 101 || 1 || On a wooden shelf at the back of the barn just northwest of the Vault.
 * Vault 106 || 1 || In the final chamber of the Science Lab level.
 * White House || 3|| At the top of the stairs (outside), near a Fat Man.
 * Outcast Outpost (Operation: Anchorage DLC) || 1 || In the armory after the Anchorage Reclamation simulation has been completed.
 * SatCom Array NN-03d || 2 || On the hands of the dummy on top of tower C.
 * SatCom Array NW-05a || 1 || At a wharf to the west.
 * Super Duper Mart || 1 || On a table near a Protectron.
 * Seward Sq. Southeast || 5 || From The Preacher (unmarked mini-quest).
 * Takoma Industrial || 1 || On the corpse of the Behemoth.
 * VAPL-58 Power Station || 1 || In a small "shack" under a large powerline support (also the location of the first Keller Family Transcript) to the north.
 * VAPL-66 Power Station || 1 || On a table next to the left desk.
 * VAPL-84 Power Station || 1 || In a trailer behind the station.
 * Vault 101 || 1 || On a wooden shelf at the back of the barn just northwest of the Vault.
 * Vault 106 || 1 || In the final chamber of the Science Lab level.
 * White House || 3|| At the top of the stairs (outside), near a Fat Man.
 * Outcast Outpost (Operation: Anchorage DLC) || 1 || In the armory after the Anchorage Reclamation simulation has been completed.
 * VAPL-66 Power Station || 1 || On a table next to the left desk.
 * VAPL-84 Power Station || 1 || In a trailer behind the station.
 * Vault 101 || 1 || On a wooden shelf at the back of the barn just northwest of the Vault.
 * Vault 106 || 1 || In the final chamber of the Science Lab level.
 * White House || 3|| At the top of the stairs (outside), near a Fat Man.
 * Outcast Outpost (Operation: Anchorage DLC) || 1 || In the armory after the Anchorage Reclamation simulation has been completed.
 * Vault 106 || 1 || In the final chamber of the Science Lab level.
 * White House || 3|| At the top of the stairs (outside), near a Fat Man.
 * Outcast Outpost (Operation: Anchorage DLC) || 1 || In the armory after the Anchorage Reclamation simulation has been completed.
 * Outcast Outpost (Operation: Anchorage DLC) || 1 || In the armory after the Anchorage Reclamation simulation has been completed.
 * Outcast Outpost (Operation: Anchorage DLC) || 1 || In the armory after the Anchorage Reclamation simulation has been completed.

Available in Other Ways

 * One can be obtained by investing twice in Lucky Harith (see Canterbury Commons).
 * One is given to you by Donovan if you experience the random encounter with him in the Wasteland.
 * Flak and Shrapnel in Rivet City frequently restock with Mini Nukes, to the extent that one can add two or three of them with every visit to sell loot.
 * Moira Brown will give you one upon completion of the The Wasteland Survival Guide (quest). She tells upon giving you it that she was going to try to make a well with it, but that the mini nuke only made her nervous.
 * Herbert Dashwood's safe contains one. You can get the key through one of three ways: Kill him, pick his pocket, or reveal the fate of his lost ghoul friend, Argyle.
 * Agatha (woman from the quest Agatha's Song) will give you the key to her ammunition chest, which contains a mini nuke and a lot of other ammunition, if you complete her speech challenge, or alternately; kill her.
 * One can be obtained along with a Fatman during a random encounter during which a dead scavenger has them on his corpse.