http://www.amazon.com/Autodesk-732E1-AHE11B-1001-Sketchbook-Pro-Download/dp/B00BYII3KQ/ref=sr_1_1?ie=UTF8&qid=1394559264&sr=8-1&keywords=sketchbook+pro (http://www.amazon.com/Autodesk-732E1-AHE11B-1001-Sketchbook-Pro-Download/dp/B00BYII3KQ/ref=sr_1_1?ie=UTF8&qid=1394559264&sr=8-1&keywords=sketchbook+pro)
Not sure if it works for people outside the US, but worth a try if you're after a cheap painting app.