Heads up: the remake of Castle Of Illusion (Starring Mickey Mouse) is getting removed from sale, from Friday (i.e. tomorrow). If you own it, you'll still be able to download it, though.
Source: http://www.eurogamer.net/articles/2016-08-31-castle-of-illusion-remake-will-be-removed-from-sale-on-friday
The PC version is 85% off right now at a few places:
https://www.humblebundle.com/store/castle-of-illusion
https://www.bundlestars.com/en/game/castle-of-illusion
https://www.indiegala.com/store/product/castle-of-illusion/227600
https://uk.gamesplanet.com/game/castle-of-illusion-steam-key--1219-1
I think it was also in the retro sale on PSN last week, but the price has gone back up now.