You gotta ask for it. It wasn't on the shelf at my target either, but I asked the guy behind the counter and he said they had the shipment in and he went to get it for me out of storage. He couldn't sell it to me though.
I mean, I tried buying it at target today but the guy couldn't sell it to me because an error code came up at the register. I don't have any issues with buying the game, and this is probably the last DS game that'll be worth buying anyway.