Updated with new Steam details.
PC gamers will find deals on lots of titles today. It's a great opportunity to pick up a game or two you've been meaning to play.
Two notes: Dishonored. Every retailer has it for a discounted $29.99. Batman: Arkham City Game of the Year Edition. Amazon and Steam both have it for $7.49. I recommend both titles, especially at those prices (just beware of Batman's always-odious Games for Windows Live integration).
Amazon's site navigation is kind of a mess. You can find the discounted, downloadable PC games here.
In total, Amazon lists 429 results, encompassing full games and downloadable content (DLC), with discounts up to 75 percent. You also get a $5 credit with any downloaded game purchase to use in January 2013 on any "2012 Editor's Choice" game.
Amazon's deal inventory dwarfs that of its major competition. In comparison, GameStop has 20 discounted PC titles. Valve Software has six.
The trick for Amazon is that it lists bundles as well as individual games. A bundle can include an entire series of games, a la the Bioshock collection, or a game and its season pass, as with Max Payne Complete. The latter entitles you to the core Max Payne III game, as well as all current and future DLC.
Of Amazon's offers, XCOM: Enemy Unknown is a highlight. Amazon sells it for $24.99. Other online retailers only have it for upward of $35.
Other standout deals on Amazon include the aforementioned Max Payne Complete for $19.99, and Kingdoms of Amalur Complete for $11.99, or $4 less than publisher Electronic Arts' own discounted version. (I'll offer the fact that I just purchased the discounted Kingdoms of Amalur as a cautionary tale about the perils of conducting this research).
For more family-oriented games, Amazon lists the Disney Kids and Family pack download for $9.99 (including Toy Story 3, Lego Pirates of the Caribbean, and G-Force games), along with an assortment of card and puzzle games. Again, click here for Amazon's complete list of discounted downloadable PC games.
The Netflix-style game rental service has relatively recently entered the digital download business, a move facilitated after it acquired Direct2Drive last year.
GameFly has discounts on 28 downloadable PC games. Of those, Spec Ops: The Line and the Darkness II appear to offer its most dramatic price coups. GameFly offers both titles for a highly reasonable $7.49. Other sites have it for between $15 and $20 or more. GameFly also offers Fallout: New Vegas Ultimate Edition for $14.99, about $3 less than elsewhere. You can find all of GameFly's discounted PC games here.
Venerable retailer GameStop has 20 discounted PC games today, and not a single exclusive. PC gamers, move on. (Click here, if you must.)
Electronic Arts' Origin digital download service was conceived to compete with Valve Software's Steam. Origin was met with derision at first from gamers, who cited poor customer service and painful technical difficulties, but at this point the service has achieved grudging acceptance.
Sifting through Origin's discount page offers a few promising deals. You can find better or equivalent prices on Electronic Arts' own titles like Darksiders II and Kingdoms of Amalur elsewhere, but it does offer the standard edition of Battlefield 3 for $19.99, which is as low as I found.
Perhaps even more enticing than yet another military shooter, Origin also sells critical darling The Walking Dead for $12.49. Amazon will sell you the Mac version of that serial game for $12.49, but only Origin seems to have the PC version for that price. Click here for the rest of Origin's Cyber Monday deals.
Update: It seems that Steam updates its list at 1PM ET, so the games listed as on sale today when this first posted are technically yesterday's games. Today's list includes Call of Duty: Modern Warfare 3 for a competitive $29.99, the throwback role playing game Legend of Grimrock for $3.74, and the Witcher 2: Assassins of Kings for $7.49, among others.
Valve Software runs discounts all year on its Steam PC game download service, so every day can feel like Cyber Monday for Steam's loyal customers.
Today, though, is the last day of what Valve is calling its Steam Autumn Sale. Promising "new deals each day through November 26th," Steam has six titles listed for today.
Of the six games on offer today, only two have prices lower than Steam's competition. Orcs Must Die! 2 is available for $3.74, and Torchlight II is on sale for $9.99. Neither game is what you would call a AAA title, but each is entertaining enough, especially for under $5 and $10, respectively.