The "one weird trick to graduate on the cheap! colleges hate him!" of choice these days is community college.
Have fun trying to get your credits to transfer. I had trouble getting credits to transfer from the Air Force Academy to a state college. They want you to do them there. They would take them as generic credit hours but it was an uphill battle to get them to actually satisfy graduation requirements (which are the real thing that keeps you from graduating, you will already have enough credit hours).
I've always heard that you should complete your AA at community college before transfering for your bachelors as it's a lot easier to transfer with the entire degree than trying to translate individual credit hours between schools.
So first two years cheap at community college for an AA/AS then you only have two years for your bachelors at a more expensive school.
Have fun trying to get your credits to transfer. I had trouble getting credits to transfer from the Air Force Academy to a state college. They want you to do them there. They would take them as generic credit hours but it was an uphill battle to get them to actually satisfy graduation requirements (which are the real thing that keeps you from graduating, you will already have enough credit hours).