The store recently switched owners and are not buying books right now, however they are accepting donations if it's just that you want to get rid of them. They also did not get a list of who had store credit from the previous owners so they are not able to uphold any store credit you may have had with the store beforehand.
I know that they buy back books for store credit. They very well may buy comics in the same way. I'd call to confirm that first though.
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