Sell Valuables: As you find collectible items such as money bags, stuff just lying around, or items found inside the glove boxes of vehicles you steal, you uncover valuables. Visit a pawnshop to turn those items into money.
Buy Ammunition: If you’ve decided to use ammunition instead of a stealthy plan of attack, you may find you’re running low on ammunition. This is the only place to purchase more, though you may find additional ammunition on the bodies of enemies you’ve neutralized, too.