They should be willing to buy them. It's been a while since I've sold cards there but they are pretty agreeable.
Bay Mehl they always can buy for some price, but they'll tell you that it probably isnt worth it if you want cash and that you should probably sell online in that case, but that if you want store credit then it's a decent deal :)
It depends how much the cards are themselves and you won't be getting 100% retail value because its a store at the end of the day and they need to make their money back
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