If you park the van relatively near two houses/ apartment doors, you can alternate between them, as the state of a house is reset when you enter another one. Two things I use to make money really quickly (other than what the other answers cover) are:
Without cheating there's no other 'very fast' ways to earn money. They usually have something like 2000$ in their pocket. The other ways are as you said to do missions or murder drugdealers. If not load the previous savegame and try again. Place the highest possible amount as a bet on a horse.Ĥ.
The most effective is the horse race technique.įor users which don't know this trick: 1. There aren't really more ways to earn lots of money as fast as possible.