From Fat Wallet...

Hot: Maxtor OneTouch 500GB External HD $43.50 (after $20 Instant Savings Code #10741) (Item #708622) Check Stock or alternate Check Stock (I'm not sure what the difference is)
Hotter: Maxtor OneTouch 1TB External HD $65.50 (after $30 Instant Savings Code #39046) (Item #742834) Check Stock
Hottest: Maxtor OneTouch Plus 1TB External HD $18.50 (after $36 Instant Savings Code #69812) (Item #728061) Check Stock (Extreme YMMV, but worth a look if you're in-store)
EDIT: Of course, if you have appropriate coupons and/or sufficient numbers of drives, you can get better deals. If nothing else, use the $5 off $30 coupon in this week's circular.
-cd
PS: I posted this in the Official Clearance thread, but thought it was hot enough to warrant its own thread.