We confirmed the cards with the California Best Buy, where reps said only $20 denominations were currently in stock and listed in the store's inventory. Jumping coasts, a Connecticut-area Best Buy similarly confirmed having $20 eShop cards in stock, as well as confirming no other types were listed, while locations in West Virginia and Oklahoma had no knowledge of the cards. If you happen to be at your local brick-and-mortar tonight and you see one, feel free to snap a shot and send it over with your name and location!
Update: We've got another image of the cards spotted in New York City, this time at a Best Buy in downtown Manhattan. Thanks Zethyr!
[Image credit: "phillipsteak"]
[Image credit: Zethyr]