I just bought the 3DS XL and two games, being this one of them but I'm still waiting for it to arrive.
Everywhere I looked this game was sold out, at least online, and now comes gamestop with a price drop... The only one I could manage to find that could ship here was on ebay and it was for 50 bucks.
I didn't know there was a demo for it. Good to know, at least now I can warm up until my game arrives.