Flour (Fallout 3)

There is only one guaranteed sample of flour out in the world. It can be found in a diner roughly north of the Nuka-Cola Plant and west of the Red Racer Factory. In addition, several vendors will sell flour:
 * Gary Staley and Seagrave Holmes in Rivet City
 * Lydia Montenegro in Tenpenny Tower
 * Moira Brown in Megaton
 * Knick Knack in Little Lamplight
 * Michael Masters in Warrington Station
 * Karl in Meresti Metro Station

It can also be found in the kind of random loot found in schools and kitchens.

Flour is used to make Mississippi Quantum Pie. It should be noted that Flour is considered a miscellaneous item, and not a food item.