ummm lets see if that math is right
you got 4 games for 80 bucks out of pocket
you traded one in for 30 (so out of pocket 50)
getting 40 back from friends
you spent 44 bucks at gamestop
wouldnt that be 54 bucks out of pocket + tax
No, it was only $40 ($10 depending on how you view it). I traded in 1 game for $30 at BB. Used that $30 GC plus $30 more in GC's to buy a Visa at BestBuy. Went to Gamestop and used the Visa to get the games.
Technically I spent $40 on 3 games worth $120.