I see this being a lot like the Cubic Ninja thing. A lot of hype and high prices for the short term, eventually followed by the bottom of the barrel price that it really deserves.
That is still rare, mostly because it was pulled from eShop (I think) and is used in a homebrew exploit. I don't think it was ever rare until the exploit was found.
If you really Want to play this game you could just download from the eShop.
That was my plan, wait it out to see if I could find a copy for retail, if not eShop.
Someone PMed who had an extra copy and is selling it to me for MSRP+Shipping.