Go to the Lieutenant's page of the Gang Organizer, open the Cars menu, and go to the "Black Market". Instead of clicking on the car you want and waiting for the money clip to appear, quickly drag the car of your choice from the "Black Market" page to the picture of it on the Lieutenant's side. If this was done fast enough, the item will be yours, with no money being subtracted. This can also be done with guns, but does not work with recruited hoods. Note: Try this first without having enough money for the object, as it takes some practice. After each time this trick is used (whether successful or not), exit the "Black Market" and return.