College options for homeschoolers

I have been looking at the cost of college tuition for my oldest who is almost 12 yrs old. I can't believe how much the projected cost is suppose to be. We didn't even pay that much for our house. He better get busy and start studying for some AP courses.

I have heard of some dual credit high school /college programs. But, I don't personally know anyone who has experience with it.

Any information would be greatly appreciated.