Fry's Electronics is selling 300GB Seagate drives (Ultra ATA, not SATA) for $99 after rebate. They also have free shipping on it.
Grab it while it's hot (if you need it, that is)! http://shop2.outpost.com/product/4280824
Last week they had the 300 gig external (usb and firewire) for $99 with rebates.
The backup software crashes all the time (I could never get it configured), so the automatic "push button" doesn't work--but then again, I don't need the driver in the background all the time just so I can push a button.