Dvd.co.uk are selling "NBA Live 08" for the Nintendo Wii for £15.99 (inc Del.)
You can get cashback through the usual sites (e.g. 4% Quidco, making it just £15.35)
The next best price seems to be £17.99 from HMV.
This is also part of dvd.co.uk's 2 for £30 deal. However, make sure you do a price check first as several of the games in this deal can be bought cheaper than £15 elsewhere.
Providing an unrivaled level of authenticity to the sport, NBA Live 08 introduces all-new signature Go-To-Moves that capture the essence of the NBA's best, and you can now play the game on a console like you see it from the stands. Pass the ball inside and rule down low with 'own the paint' post play. String together combos of fakes and shots to fool your defender into committing and create space for the game-defining bucket. On the perimeter, in the paint, and with unparalleled depth, dominate with your go-to move with NBA Live 08.