The couple of schools I have looked at actually require you to have full coverage insurance - if you are covered under an employer plan, great. If not, you have to buy their coverage - the one I found pricing for was $1800 a year for the student (includes prescription coverage too). I don't know if all schools are like this though.
The school I got accepted too also have student Health plan included in your cost of attendance and they give you financial aid accordingly. If your school has a medical center the coverage is actually cheaper.
In Illinois, all college students are required to have health insurance, and so, the colleges offer it. Since my school has a medical center, it is extremely cheap, $300 per semester, but it is an in house HMO.
Oregon State, USC, LLU, and Western all had insurance available. I'm going to compare to my COBRA for cost since I'll probably have to quit so I can attend regardless of where. COBRA should go up to 18 months if I go that route. Hopefully I'll be able to get some sort of state-sponsored insurance, if not I'd probably go through the school.