in California, community college tuition is on the order of a grand a year, full time (in state) - less if you are only going part time, which you probably would be, if you're working enough hours to get the walmart reimbursement.
At those rates, the expensive part is the time off work, even when you are only making $11/hr. (I mean, employer reimbursement is still a nice gesture, every little bit counts.)
I find it... unlikely that the private universities are cheaper than the community colleges.
Now, your last two years, at a state school, in California are closer to six or seven grand a year, full time, so half that for your half-time plan, and that's a much bigger bite, but I still kinda wonder what kind of private school could do cheaper, though we're getting more realistic.
In California, at least, if you go to any of our very good public schools, you will almost certainly be paying more just to keep yourself alive than you will be paying in tuition
(which isn't to say I don't think we should subsidize them more; I'm just saying that most of the cost of going to california public schools is... living in California.)