Wow that is some serious overcharging, my local store sells almost every game they have for about half of what they charge and these are the versions that are pristine but are not CIB. Just looking at F-Zero for SNES made me laugh, $20 for a cart only version no thanks I can easily find that for $5 any day.
May have to check out there trade in prices though since my local store is hit or miss on some retro games for trade in.