Go to Angel's Casino and destroy all of the slot machines. When the screen cracks and the machine falls over, you will see a stack of cash fall out. Collect all of the money in the casino by destroying the rest of the machines. Then, go to a nearby crib that is not Angel's Casino and save the game. Load the saved game file. You will still have the money obtained from the previous machines. If you go back to the casino, you will see new machines that can be used to get more money. If you destroy all of the machines, you will leave with a couple hundred dollars every time.