Blue Sun Mod 1.9

There are only one person that sells cars in the game, Rico Reyes in Cali Cantinos. You need the required money to actually buy one. Never order one, it wont come.
At the army base you can gather 3 NPC's that help you with different things. The Medic that heals you for free, the mechanic that repairs your weapons(need to hold weapon in hand for it to work) and you can get a trader that has the most impressive arsenal in the game.