I was surfing through Amazon and found these drawing programs on sale. I don'k know how long they will be at this price though :/
Autodesk Sketchbook Pro 2011 - $31.99
I've never used this one before but there are a lot of tutorials
here . This is one is tempting me >_<
Manga Studio EX 4 - $85.96 (This is the one I use and the regular price is $299.99) !!! Careful! It doesn't say it supports Windows 7!!! Careful! Though my laptop IS Windows 7 but I downloaded at the site. Be sure to check this.
G'luck!