They have it marked as "low stock" but Bundlestars
has a nice set out for $4.99 (all Steam keys)
S.T.A.L.K.E.R: Call of Pripyat
Of Orcs And Men
It came from space, and ate our brains
Merchants of Kaiden
The Original Strife: Veteran Edition
Letter Quest: Grimm's Journey
Of Orcs & Men is a very linear but somewhat entertaining RPG with Dragon Age-esque combat where you play an orc and a goblin trying to kill the human emperor and stop his war against your tribes, Stalker: Call of Pripyat is a classic FPS, the sequel to Shadow of Chernobyl and Letter Quest has proved a good deal of fun for me -- you play a cartoon grim reaper fighting his way across the landscape (to get pizza). When you fight a monster, you spell words from an random assortment of Scrabble-style letter tiles, doing damage based on the words you create. As you progress, they put limitations on you such as each word needs to contain a top row letter or the monster only takes damage from words with two vowels. Anyway, fun game and easy to play in small doses since each "dungeon" only has one or two monsters in it.
I'm not very familiar with the other games but those three alone more than make it a deal for five bucks.