I live in a larger city, and considered 1/2 dozen or so schools in commuting distance from my home area. My primary consideration for post-bacc science coursework was that the school was an accredited 4 year university, rather than a community college, as some med school admissions committees have told me that they consider community college science coursework differently than they do university coursework. I was surprised at the substantial price differences between schools, and found one that worked well for me; $1,600 per semester for 16 hrs (in-state tuition) + books, which is 1/2 the cost of other nearby options.
I was able to self-fund post-bacc studies at those prices, federal student loans mentioned in previous posts would be a good way to cover the costs if employer payment is not an option.
Although I'm enrolled as non-degree seeking, I've had good luck getting into the courses that I wanted by either enrolling directly, or if the class was full, speaking with the instructor and attending courses as a "waitlist" candidate until inevitably a number of enrolled students dropped the course.