I am assuming the OP has the pre-req's done as the program only offers courses such as his upper division sciences. OP if your GPA is near or above 3.0 and you are just looking to improve it a bit by retaking courses please do yourself a favor and do it as cheaply as you can. Unless the post-bacc has a bridge to an MD program you are interested in, do not go into $30k of debt just to push your GPA up by a few decimal points.
As I'm sure you're aware DO allows grade replacement and they don't care if you replace those grades at Easy Close and Cheap CC or Harvard. Retake your C courses and save the money for your applications and interviews.
The fact that this program offers not just upper division courses but also lower division courses for the pre-req. definitely CC is cheaper, but for the program, your money is well-invested, you pay for the course, and you have tons of helpful ECs, international medical trips, academic advising, etc. all sponsored by the school. So, taking the program not just enhances OP's academics but also ECs. I just want the OP to think about all the benefits she can have with the program as compared to CC. For the post-bacc with linkage to MD program, do you think it is easy to get into? If it is easy, then everyone becomes MD through such program. It is like a conditional acceptance to MD, adcoms dont easily take weak applicants and for such program, very limited number of applicants are accepted.
FYI, I am a CSUEB post-bacc alumni, I only had to spend $15k to enhance my academics for 1 year (4 full-time quarters, one of those is summer). I applied this cycle and succeeded with a bunch of interview invites and acceptances, hold at some place but no rejections thus far. I dont regret taking this program, it helps me very much more than I expected in terms of academics, ECs, and LoRs.
I also personally talked to a few adcoms, they said they take into account competitiveness of the school and the major... Do you think a post-bacc at a California state university is as easy as at CC? I value your opinion and advice to save money, but if you dont know anything about the program spcified by the OP, how could you compare the benefits and advantage other than just the money?
I have a suggestion and it is up to you. If you also want to save money, then you can retake pre-req at CC and take upper division courses at CSUEB, this program actually also lets you choose which course to take to enhance your academics, some professors are from UC Bekerkley, so the level of difficulty is not changed much.
Once again, it is your choice OP ! Either retaking at CC or CSUEB post-bacc, you need to work very hard towards your goal !