Those things are ALWAYS in someboby's Sunday Flyer (CompUSA, Best Buy, Circuit City, etc.) If you have a little time, something will pop up shortly. Also, try this site . I ran across it a couple of months ago and it yields nice pricing results with great seller ratings info to boot. You might even try to search for those puppies with "OEM" somewhere in the description.
Sites I've used in the past for computer purchases: Pricewatch and Pricegrabber....more the former, but Pricegrabber has been helpful with other elecronics purchases.
Also, I'd recommend against Maxtor SATA drives, unless you specifically want the QuickView drives for PVRs. I sell/support the SATA chips in their drives. Go w/ Western Digital.