Ends 11/21. Newegg has the Seagate STAM3000100 3TB GoFlex Home Network Storage System + Rosewill RNX-N150RT 802.11b/g/n Wireless Router for $130 with free shipping. A two part system consisting of the dock and the actual 3TB external HDD, allowing wireless file access and back up for multiple computers. 
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That's a really cheap router - normally $15.
If you just need the 3TB backup, without the wireless, then Costco have the Seagate 3TB Backup Plus for $100 this Friday:
http://www.theblackfriday.com/ads/costco/costco-black-friday-ad4.shtml