Wow, $100? That's a steal. Those are usually $175+
Especially at Best Buy (hate that store). I just bought a 500gb Seagate for $80 last month. Would have cost $50+ more at Best Buy.
But clearance items are where it's at. Picked up a USB power hub for $7.50 at a local department store. Works great so far... Bought a $20 External HD enclosure at Radio Shack. LEDs went out after a month and I began to question the quality of the circuitry on it (plus it ran hot), so I pulled my HD out of there and stuck it in my case. Tried getting warranty on it, but the company is MIA/KIA, thus the clearance. I actually called their support line after some digging (their site was down, had to use Google cache) and I got some guy's voicemail.
It's in the garbage now.