Question: There are quite some houses and clothes for sale, but I do not have any money. What is the fastest way to get money in GTA San Andreas?

Answer: 
If you have no problem with using cheat codes, this cheat adds full health and armour, and gives you $250,000! 

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If you start at the downtown hospital, head right, then turn right at the first road, on your left-hand side you'll find an outdoor "mall" or concourse. In here, you can hide from the police helicopter, and cars cannot get at you. There's also a soda machine that you can use to heal yourself.

Run around in circles here, taking out everyone and all cops; you'll get a pile of handguns, and money from all the citizens wandering around, and if you're careful, you'll never get wasted.