ChoicesUK is selling "Finding Nemo: Escape To The Big Blue" for the Nintendo DS for £9.99 (inc Del.)
You can get cashback on top of this through the usual sites (e.g. 5% Quidco, making it just £9.49)
When a young clownfish named Nemo is captured by a diver on his first day of "school", his father, Marlin, embarks on an unbelievable quest to rescue his son. Extend the magic of the Disney/Pixar film and grab your chance to become Nemo as you play Finding Nemo.