I've been having such a good time with Minecraft, I thought I'd bring some other bargains to everyone's attention (plus, I want to have more friends to play these games with!)
1. Greed Corp: $5 on Steam, last time I checked. 1-4 player simple strategy game. Game boards made of hexagons of varying heights. Build armies to take territory, then harvest said territory for money to expand your army. But beware--your harvesters cause the tile they're in and all surrounding tiles to drop one level. When a tile hits level 0, it crumbles, causing all buildings and armies on it to fall to their death/destruction. Last man standing wins.
2. Blood Bowl Legendary Edition: $10 on Stardock Impulse--this is the service from the developers of Sins of a Solar Empire. I've posted the original game before--they've added ALL of the races from the Warhammer universe, tons of new stadiums, etc. etc. Best part about this one is that if we get another 4 people or so playing this one, we can run our own private leagues. Discount link here. Edit: you can just order right off the website, but you do have to install Impulse before you can install the game.