Rolling pin

 is a Melee weapon that can be found in the Capital Wasteland.

Tranquility Lane version
A special version exists in the simulation Tranquility Lane, with significantly higher damage. It is found on the kitchen table in the Rockwell Residence.

Killing anyone in Tranquility Lane is temporary, as talking to Betty will reset them until you activate the Chinese invasion simulator, then they are dead for good.

Locations

 * In the Taft Tunnels not too far from the last door with the Brotherhood of Steel guard on a table near a plush chair.
 * In Mama Dolce's Food Distribution, top floor on a desk near Mama Dolce's Loading Yard door.
 * Found in various containers as a leveled item.
 * In L.O.B. Enterprises inside a trunk.
 * In one of the metal boxes outside Agatha's house.
 * In some cases, Walter's house in Megaton behind his bed in the metal boxes. (If you haven`t blown Megaton up)
 * In Lucy West's house.
 * In the Wilson's mailbox in Andale.
 * In Craterside Supply on the second floor in a metal box under a smaller metal box.
 * In Wilks House at Grayditch, inside a metal box near the couch (found randomly)
 * In Canterbury Commons in a random mailbox.
 * Under Arefu, under water in a safe.
 * In Vault 87, inside a metal box behind a locked (average) door in the living quaters.