Recently on Gamestop.com the 250GB hard drives for the 360 Slim's have been made into an optional purchase. They also come preloaded with game demos of A Kingdom for Kefflings, Peggle, and Pinball FX.
Woo-hoo, I guess? Who honestly needs 250GB worth of 360 space anyways?!
Full article: http://gear.ign.com/articles/111/1114841p1.html