http://www.artstyles.org/art-supplies-for/
Where can I return art supplies without a receipt?
I live in San Antonio,TX and I’m looking for a place that sells art supplies with a flexible return policy. I have a couple brand new items but I lost the receipt.
I know of other places that take back products, even from other stores, but none of these sell art supplies. 
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Every art supply store in San Antonio is going to require a receipt for any returns. Why can’t you return it to the location where you bought the supplies? That would be the best place because they should be able to look up the purchase in their records to verify what you bought and how much you paid.
I know you are not trying to scam the store. A better option would be to just put them up on Craigslist and see if you can get most of your money back.