GOG.com is running limited quantity sales. Once they sell through they post another game. They've posted a lot of sub-$5 games so far.
http://www.gog.com/
http://www.widescreengamingforum.com/forum/viewtopic.php?f=64&t=18199
Well that sucks. Seems like it will be playable in portrait, especially if you can limit the AR to 16:10 or something close to it. Really ruins my day, though.
GOG.com is running a BOGO promo on Interplay games. The Fallout titles are the main attraction, but there's other interesting ideas like Giants: Citizen Kabuto, Shogo, Jagged Alliance 2 and the MDK games.
This is all DD, but GOG removes all DRM from their catalogue. Any games that are too old...