Western Digital 2.5TB Elements External HDD 3.5" USB2.0 for $109 from JWComputers.
Western Digital WD Elements Desk 2.5TB Hard Drive
Seems Like a pretty good price, on clearance. Product Details: Colour: Black Dimensions(WDH): 116x179x36mm Size: Desktop Weight: 1.02kg Features: Plug and play Designed to save power
Saw this on the office works website, sounds pretty cheap for 2.5TB HDD.