Trade PSN Batman Arkham City DLCs

Went to gamestop today and got the batman arkham city game with all the dlc to go with it for the xbox. I told the lady the dlc is for xbox when asked, thought everything was fine till I got home and found all the dlc was for the PSN. Called them up to tell them they gave me the wrong system codes. I was told since I left the store they couldn't trade since they don't know if I used the codes already or not. I am stuck with these worthless to me code since I only have a xbox. What I have is following for the Playstation:
Robin DLC
I'll take 400 micro points or $5 credit towards amazon.

One Robin DLC is still up for sale, don't let the boy wonder be alone.

anybody want him?

I'd take it if you took paypal

[quote name='kube00']I'd take it if you took paypal[/QUOTE]
I got burnt by pay puke before so I have no desire to go with them again.
But with that said offer any thing else that will work on xbox360.