Can't visit from work, but I picked up the SC2 + 1st expansion from Amazon couple months ago for $21 shipped. Now just waiting until final expansion goes for $20 or less. 🙂
They're keeping the game updated with new content pretty well. I'm gonna try the Co-op again once the next patch hits. Also thinking about getting the Nova missions right now, I doubt they'll be on sales anytime soon.
New co-op hero out today (Abathur). Played a couple games with him, he's pretty OP. They added weekly co-op "mutations" as well, basically the Tavern Brawl mode of SCII.