The "build robots to punch monsters" game Goliath is on sale today on Steam fro $4.99/75% off. In case anyone in this thread is still actually looking for Steam deals. ; )
http://store.steampowered.com/app/363520/
Casual PC game publisher Viva Media has almost all games on sale for $0.99, $1.99, or $2.99. Discounts of up to 95% off. If you like hidden object, time management, match 3, etc., check it out.
http://www.viva-media.com/