In Fallout: New Vegas for the PS3, Xbox 360, and PC, there is a way to use an exploit in the game to gain as many caps as you want.
Note that this will most certainly be patched if it hasn’t been already, so if you plan to use it I would suggest waiting to download any patches that are released. If you have already patched your game, check out my guide to easily win at the Caravan card game, which is another way to get easy caps.
Head to the town of Primm and successfully complete the “My Kind Of Town” quest so they get a new sheriff for the town. Once you complete that quest, you’ll have to wait a few game days for the Vikki and Vance Casino to open again in Primm.
Once the casiono opens, either win some chips from gambling or exchange a large number of caps for chips. Go to the cash register to trade the chips in for caps. You’ll notice that when you trade in your chips for caps, you get your caps but you won’t lose any of your chips. Keep trading in your chips and you’ll get as many caps as you could possibly need.