GOG is "good old games", though.
Desktop Dungeons isn't that old and certainly not a classic at any rate
Speaking about GOG.com again - this service changed his profile few months ago. Currently, not only "Good Old Games" are sold, but also newer games (like Assassin's Creed or Alan Wake) and even new indie games (like Botanicula or Legend of Grimrock). Currently, One indie game is available for pre-order (Retro City Rampage). Before that, the service made an experiment by selling The Witcher 2 as a first new game.
These are the currect price tags (excluding free games, promos and special price for The Witcher 2) - $5,99, $9,99, $14,99 and $19,99. Last two were introduced with new site's profile.
I'm not working for GOG.com, but that's my favourite digital distribution service of PC games.