If you've ever collected baseball cards, comic books, stamps, or maybe those limited edition commemorative plates, you understand the concept of the "Holy Grail" item.

It's that last, hard-to-find, incredibly rare, usually expensive piece that you have to have before you can officially say your collection is complete. If you're a collector of vintage home video game cartridges (or "carts"), sometimes that can mean paying a pretty penny for the pièce de résistance.


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