GOG.com, known for their DRM-free catalog is currently having a sale for 32 titles that the website will no longer be carrying.
There is no said reason as to why the games are being removed, but in a blog post, the website confirms that those who bought the game in the past and those who buy it now will always have access to the games and all their extra content should the customer delete it.
The discounts here are pretty steep, some going up to 80%. Worth noting is Amnesia: The Dark Descent which is going for $4, saving you $16. The sale will continue until September 2 at 3:59AM GMT.
For the full list of games, check this link right here.