Here's a risk-free money glitch on GTA 5 for you. No cheats so you can still get trophies/achievements.
This way you can buy everything you want!
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Cheers.
*UPDATE*
t does work on all three characters. When you hit 20 million, keep doing it with 20 million steps, dont go over, it won't work. When you have 25 million, you can do it with all your money! for some reason it doesnt work between 20-25 million.