check ebay and see what other r selling.
i think:
1) kaplan: 50-75 (only have the course books, tests, barely any practice material)
2) princeton review: 100-150 (they have sci review passages, verbal workbook, tests, stuff people can use to study indepedently)
3) berkely review: 100-125 (a lot of passages, but passages which don't exactly cover mcat stuff; maybe good for peeps trying to relearn basic science for mcats).
I think PR is best material for self-learer. that's why u barely ever see it on sale at ebay. for someone who takes a class, kaplan will have more rigorous passages, which they only keep in their libraries.