Clip Studio Pro, is the latest version of the product formerly known as Manga Studio, is going through a massive sale through July 14th. Now, for $15.00 US, you can get a copy of Clip Studio Pro fromt he following Link:
http://www.clipstudio.net/en/purchase
I would suggest you get it.

Here, I just got it, and this is 20 minutes of me penciling, and inking digitally, using a Huion H610 Tablet, and checking the response of the tablet with the new software. its a little rough, but it's basically a sketch, totaly digital from front to back. If you do comics or like smooth inks, I do think that you should get your copy. Hope this helps.

Scott