dvd.co.uk are selling "NiGHTS: Journey of Dreams" for the Nintendo Wii for £12.99 (inc Del).
You can get cashback through the usual sites (e.g. 4% Quidco, making it just £12.47)
The next best price seems to be £15.93 from The Hut.
As a fantasy jester called NiGHTS, players will fly through Nightopia, a rich and vibrant world where dreams come to life. With the innovative Wii Remote, gamers will experience a heightened sense of gliding, spiralling, and looping through seven mystical dream worlds packed with high-flying adventure. Players must find inventive ways to confront the Nightmarens from the neighbouring dark world of Nightmare using amazing acrobatic skills, freedom of flight, and other special abilities to protect Nightopia. NiGHTS: Journey of Dreams is an adventure filled with courage, hope and inspiration that the whole family will enjoy this holiday season.