This deal has ended.
Update: this has now jumped up to $94.99. Today only, Amazon has the 500GB Hammer HP1100-500 Morespace Portable Hard Drive on sale for just $78.39. Compatible with both PC and Mac, this measures just 4.8" tall x 3.2" wide, which is impressive for a drive of this capacity. Shipping is free and there is no sales tax (except KS, KY, ND, NY, WA). Compare this price to $120 at PC Connection.