Look at some of the graphics tablets; they often come with a scaled down version of expensive design software.

The cheapest Graphire is $99 and comes with Photoshop Elements 3, Corel painter and some plugins. Being able to use the stylus as an airbrush, pencil, pen etc... makes for a really creative solution. I think Sams and/or Costco carry them for under $85. In the UK check your local superstore...

Edit, link:

http://www.wacom.com/graphire/index.cfm