Fable II is supposed to go for $US20 if you download it on the Xbox 360. But, less than two weeks before the release of Fable III, it it now free on the Xbox Live Marketplace.
Smells like a marketing stunt and a bargain. Got 7GB free? Then go for it.
NOTE: We know that some of you aren't getting this to work. On our end we're seeing mixed results as well, but we do have a free download in progress.
We're checking with Microsoft to find out if they goofed or if their prices really are that insane.
Pic via FilmDrunk