Besides that, all that is somewhat worth it are the painkiller titles at 90% of each (0.49$-0.99$ and also as a pack), but I hear most of them are really bad...
From the original games, the first two (Black Edition and Overdose) are the best. As for the rest in the original series, Resurrection is the worse. And as for the reboot/remake (Hell & Damnation), the base game is lacking some levels from the original, but it has better graphics, gamepad support and everything else you would expect from a 5 years newer game, and depending if you prefer single player content, the DLCs for single player are good, most of them expands some levels, add more weapons and new enemies, and add some few levels more for a low price. There are also a couple of free DLCs too on Steam to add to the main game. But buying the whole collction for $6,99 (-90% discount) is an awesome price to get everything, and probably, the best deal to get the best (and everything else... :P) in that series.
...Anna Extended Edition which is at 1.99$ (and was cheaper on bundle stars @1.49$ before)
Anna is a strange game, it had potential but it has so much backtracking is a small place. I played and finished it with a few endings, but I didn't get all of them. I played the Extended Edition but still the game had some nasty bugs that can prevent you from completing the game, like some specific events that should happen to continue but they never do, or places that should be accesible to continue, but they aren't (it happened to me, that's why I dropped it when I tried to get all the endings, check its forum on Steam for more information). As for the game, it's scary, but short and a little boring. Nice graphics, but a little too dark though. Mostly you will be walking in a cabin looking for items to use in some place to get access to other parts of that cabin, while avoiding *something* to not get "crazy" enough to end the game... that's it. I can't tell you more because if you get it, I don't want to spoil the story. The more you continue, the more you reveal from the story. The game requires an extra account to access the game (Kalypso Launcher), but you can avoid it if you block it in your firewall so you won't need to log in with that and go straight to the game (I explained how to do that in that forum, but I can't remember in which threads, but it's really easy).