This is the cheapest i can find...argos and toys r r us are doing it for £74.99
Media Desktop is a unique desktop computer that will keep children entertained for hours! 60 games and activities include English, French, maths, science and social skills, all covering Key Stage 1 with some touching on Key Stage 2. Internet connectivity via a PC; log on to Planet VTech to download additional games and activities or play online.
Plug in an MP3 player and listen to music whilst playing games. Includes full QWERTY keyboard, mouse and mouse pad.