PLEASE HELP! mac eyeshadow!!?

okk so off ebay i ordered a mac pro 180 eyeshadow palette anndd i would like to no if i was ripped off by paying $91 for it .. (it was unopened and new) ...so wats the RETAIL price?? ... is it goood?? and also people seem to say mac PRO doesnt have a 180 eyeshadow palette?