damn it seems like i've been playing FOREVER, and i'm only 30% done. I have close to $400,000 already though.

If you want easy money, just find the big bank that is on the middle island (the one you have to rob). Sit outside and an armored truck will ride by sometimes. Blow it up with a RPG and money will fly out everywhere. Sprint around and pick it up. You will not be able to pick it all up before it disappears. I usually pick up around $5k. I don't really hang around the bank, but if I'm ever riding by, I'll look around for the truck. They can be found anywhere on the island.