Slashdot linked up this nifty Ebay auction:

HAL 9000 is the Cinerama 160 degree Fairchild-Curtis lens used to film the actual scenes from HAL's point of view for "2001". It also doubled as the prop, the eye of HAL 9000. HAL is one of the few artifacts left from the movie “2001”.

Cool also for the trivia point that the camera filming HAL's point of view was the actual camera you saw in the film.

See Joshua? Toldja ya shouldn't have bought that TV. Why, for... 25 times more, you could've had this!