I did find some RoboCycle decks at the same Walmart. I also recently found some Dragon Backs at my local Walgreens. I collect Bicycle decks, but my one rule is that they must be purchased at a physical store, not online. Walmart is making it easy to collect! I might go buy two more of these Nautic Back decks so I have a pair to open.I always check the card section of WalMart when I'm there. They frequently carry the oddball Bicycle cards (Which is another reason I don't hesitate to use custom cards), but only in small numbers usually. Anything you see there on one day may well be gone forever by the next.
I found one deck of red Leaf Backs at Walgreens. I highly suggest everyone check out Walgreens for Bicycle cards if you have one in your area.I'm annoyed with myself for not snagging the RoboCycle's I saw at WalMart a while ago. Target occasionally has some interesting ones. I got Leaf Backs at WalMart as well. Also the first and second editions of the Limited series Bicycle was doing for a while.