I'd call around to local stores in podunk towns that may be lucky to get a shipment, but few orders. For Nintendo Wii games that are impossible to find, I can always find whatever I need at the small Buffalo, MO mini-Walmart... a town close by. Just have to wait in line behind all the guys getting ammo.
But really, A friend was in St Louis a few weeks back and saw 2 sitting on the shelf at some camera store. You'll have to do some homework & make some calls to find one.