$210 (free shipping) for a 1TB Seagate Free Agent Pro. Upside, you don't have to buy an external case. Downside, orange light rather than blue, and it's fanless, so I couldn't in good conscience advise it for continuous use like the last-gen Seagate externals. But if you need to back up the TB you bought the other month, it's a great deal*. Keep in mind Buy.com sometimes sells out very fast on their weekly deals.
Angyl sez, thumbs-up!
* Not as great as the $150 750G FreeagentPro w/USB/Firewire/eSATA I picked up from Frys.com the other week, but that was part hack and it sold out by the time I got my order confirmation.