Throughout the Mojave I walked into the Casinos, winning all my games and amassed a Fortune of 49947 caps in game that would probably make my Courier the equivalent of a millionaire :
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Fallout 3" and "Fallout: New Vegas" Cheats and Codes - LevelSkip
Bizzarely, no vendors have caps, and despite having caps myself, none show up. Any fixes? : r/FONC
How to Get infinite caps and ammo in Fallout 3 for XBox 360 « Xbox 360 :: WonderHowTo