Dvd.co.uk are selling "EA Playground" for the Nintendo DS for £9.99 (inc Del.)
You can also get cashback through the usual sites (e.g. 4% Quidco, making it £9.59)
The next best price seems to be £12.93 from The Hut.
EA Playground smartly delivers both traditional favourites and all-new playground games. Every game is uniquely designed with the Nintendo Wii's unique controls in mind. Whether you are swinging the Wii Remote to throw a ball at your opponent in dodgeball, using it to bash away at a tetherball, or navigating a paper plane through a school hallway obstacle course in Paper Pilots, you'll experience the Wii in a completely new and refreshing fun way. Play these games and more: Dodgeball, Tetherball, Wall Ball, Kicks, Slot Car Racing, Paper Pilots, and Dart Shootout. There's more fun to be had in the rich Single Player mode. In this mode, you'll explore different areas, meet Playground bosses and beat them at their own games. But watch out, because the further you go in the game, the harder the bosses play. Collect marbles, earn stickers you can use as power-ups, and make the grade with an