Incredible. I can't justify buying it at full price, already having it on Wii U with the DLC, but if it somehow ever becomes a "Greatest Hits" (or whatever Nintendo calls them) I'll definitely pick it up.
MK 8 Deluxe edition will never go down in price.
edit - the original Mario Kart 8 is STILL selling for full price
double edit - okay, you'll probably be able to get it $10 off on amazon or something like that