5 games on sale on Steam right now for $9. The entire Trine trilogy, in addition to two other games, Shadowgrounds and Shadowgrounds 2.
I already bought mine. I played and beat Trine 1 on GOG a few years ago, it was a great sidescrolling game, and I'm not usually too big into side scrollers, but I thoroughly enjoyed this one.
Just the first game is worth $9 in my opinion, let alone getting the second, third, and two other games. I read that the third installment bombed because of budget and the devs ran out of money, which is terribly unfortunate, but still worth it for this price imo.
Thought I'd let you guys know.