The cheapest you're going to get is $10K a year (and that's hard to find), and that's just tuition. If it's not near your parents' home then you're looking at $25K/year bare minimum (as in living off ramen packs and peanut butter). So that's $100K that your parents have to have saved up (per child) or which you have to take on as debt.

Just looked up our main state schools and cost of attendance is $31K - $35K for in-state residents. So that's $120K - $140K for 4 years (not counting increases). And these aren't top-100 schools either.