I think as others have mentioned, trying to find an employer with educational benefits (e.g., universities) or taking the cheaper route with a community college might be your best bet. Personally, I worked/saved for a number of years to ensure I had the financial resources to fully commit to a post-bacc.
Is there any specific reason you want to condense 24 courses into one year? Maybe you could stretch that out over 2-3 years while working? I obviously don't know your situation, but you also need to consider fitting extracurriculars like volunteering and shadowing into your schedule, not to mention finding time to sufficiently prepare for the MCAT. Seems like all that might be difficult if you're overloaded with classes.
One other thing worth mentioning is there are many costs associated with this path in addition to your post-bacc courses. One needs to consider things like MCAT study materials and testing fees, primary application fees, secondary application fees, CASPer fees, travel expenses for interviews, moving expenses should you be admitted to a school outside of a commutable distance, etc. It all adds up to a significant amount of cash outlay.