Clair is correct they will give store crdit
No. I believe they only will trade in for store credit.
It depends. You will want to bring them into the store and talk to them in person as they will need to inspect them for quality and condition before making any formal offer.
1/3 of worth for cash 1/2 worth for in store credit
Maybe
Not worth it anyway, value in Yugioh cards have dropped alot.
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