I just wanted to give a heads up and pass on a sale going on until March 19, 8:00 AM (UTC/GMT) of 50% off
Clip Studio Paint Pro goes from 49.99 to 25
Clip Studio Paint EX goes from 219 to 109
and the upgrade is also half price.
https://graphixly.com has it on sale and I think you can buy direct from them, Graphixly sells also on amazon but the sale price isn't listed there.
http://my.smithmicro.com/manga-studio-5.html on sale for 15
Nice addition or substitution to SAI from what I understand (I Haven't used SAI just parroting what I have heard).
It ends today however sometimes it isn't over first thing in the morning.