Never have been able to. As a single parent, every penny goes towards needs and bills. There is nothing left over for extra's. He can pay for college like I am, through grants, scholarships and loans. There are BILLIONS of dollars in grants and scholarships available, if people are willing to look for them. Here are 2 websites to do that.
www.fastweb.com
www.scholarship.com
set up profiles for your child and they will send you scholarship and grant notifications. Some are needs based, some are just writing an essay, some are for being certain ethnic backgrounds and some are for hobbies, sports or where the parent works.