Quotes as of 03/08/12:
Modnation Racers $5
Monster Hunter Tri $7
New Super Mario Bros Wii $20
The young female cashier obviously had issues as she wound up giving me the trade in values for Monster Hunter 3 Ultimate & New Super Mario Bros Wii U instead. I was going to take the extra credit and just roll with it, but decided against it. The whole irritating thing about it is that I had to wait a little bit of extra time for her to get everything straight.
I used a $20 used coupon with the transaction to pick up a used Tomb Raider, but she was trying to talk me out of using the coupon again. I said no way as I did not want to pay anything out of pocket, plus I know with the coupon being redeemed with the prior transaction that it would be hit or miss if it would work again.
In hindsight, seeing as GS has previously screwed me other trade promos, I should have taken the credit and ran for dem hills.