We have all been in this standoff. You are at a card show, standing at a dealer’s table with a slab in your hand. You know the last eBay sale was $100. The dealer knows the last eBay sale was $100.
While it has never been easier to find out how much your cards are worth, selling them for that price can still be harder than you’d expect. Mantel, a social-media platform for the hobby, is hoping to ...
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