Next cheapest i can find is £14.67 @ Amazon UK. This is available for delivery or Reserve & Collect.
Think its a cracking deal has a lot of good reviews and cant go wrong for less than £10 for a newish Wii game.
Might be better off Collecting at store to be guaranteed you get it in time for Xmas.
Enjoy and Merry Xmas!
EDIT: Just noticed Table Tennis and Funfair Games are this price too. Added to Title.