You can smash cars and it will give you $400 and more for each car. You can fit two cars in the crusher.
Easy Cash And Free Ammo
When your playing go to any gun store. Walk in if you have a gun pull it out (if not buy 1 but don't buy ammo) pull it out but don't shoot the guy he will pull out a shotgun. Put your gun away then punch him. When he falls take the cash from the register you should get about $600 then get the ammo.
When you try to rob somebody you don't have to kill them you can just push them down and rob them (if it don't work punch him down)then take the money or clothes, guns, or food then run.