GamersGate - Batman Arkham City, $19.98

[JoJoBlue]

http://www.gamersgate.com/DD-BMAC/batman-arkham-city

This is a daily deal for GamersGate's holiday sales, so it'll be gone at about 3AM EST, December 25, 2011.

Edit:
I guess I might as well mention some other PC Direct Download deals while I'm at it.

Dragon Age II @Direct2Drive for $4.95 - http://www.direct2drive.com/9950/product/Buy-Dragon-Age-II-Download

Saints Row III + Season Pass + Professor Genki Pre-order bonus for - £14.99 (approximately $24CAD)
http://store.thq.com/store/thq/en_G...?ClickID=cq47pwf44fwqqlieeelnsnqvfxzwvnni7nqe
You'll probably want to remove the extended download service fee on checkout.

Steam has some stuff, such as Borderlands for $5, Skyrim for $40.19, Company of Heroes Complete for $9.98, Plants vs Zombies GOTY for $3.39 and a lot of other sales.

Note - Most of these seem to be daily deals. Unless specified, the listed prices are all in USD.

 

[Booyakz]

Saints Row The Third + Season Pass + Professor Genki Pre-order bonus is an AMAZING deal for $24. I bought the Special Edition ($100) and paid 1600 points ($20) for the Season Pass, and still believe it to be the best purchase I made this season, apart from Uncharted 3's Special Edition (only because I love that franchise, and the extras were utterly amazing).

At least 30 hours of awesome gameplay in the base game, no idea about the length of the DLC yet.

 

[AftComet]

FYI - You CANNOT activate this on Steam. It's only a Steamworks title when bought on Steam. Otherwise it's a regular GFWL title.