HMV are selling "Sega Bass Fishing" for the Nintendo Wii for £17.99 (inc Del.)
You can get cashback through the usual places (e.g. 5% Quidco, making it just £17.09)
The next best price seems to be £22.95 from BlahDVD.
'SEGA Bass Fishing' is back and better than ever, returning with all-new intuitive controls utilizing the Wii Remote and Nunchuk. With over 20 different types of lures to choose from, gamers can cast off using the Wii Remote to try and land one of four different types of freshwater bass.
'SEGA Bass Fishing' also offers gamers the freedom to select time-of-day and season during play which impacts the activity of the fish, their appetite, and their depth. When players hook a big one, they can use the motion sensor to reel it in! Featuring 15 beautifully designed lake environments, 'SEGA Bass Fishing' has four fun-filled game modes including Arcade, Tournament, Practice and Nature Trip modes.