Might wanna check out these sites and see what you find. Your not going to find a 7200 drive for $99 though. In fact I don't even know of place that has 5400 120's at $99.99. Good Luck and let me know if you find a super sweet cheap deal.

www.newegg.com
www.mwave.com
www.googlegear.com
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40GB Mk2 [blue]blue[/blue] 90000660 Driveless Mk2a [blue]blue[/blue] 120001040