When I was working on my B.Sc. (in the 90s), I worked 3/4 time for $8 per hour and went to school full time. Even at that wage, I could afford to pay for my college education and was able to graduate with zero debt.
Is that even possible these days? Rarely, I'm sure. Of course I wasn't so lucky with my M.Sc., but at least my current wages allow me to pay on the loans.
Due to skyrocketing college tuitions, I have plans to buy 4 years of college at today's cost for my son who is currently in sixth grade. It will be a good chunk of money up front, but I expect it will save me quite a bit of money six years from now. I'm just lucky I have the ability to do so.