TigerDirect offers the WD Elements 2TB External Hard Drive - USB 2.0, Plug and Play, For Mac and PC - WDBAAU0020HBK-NESN, bundled with Total Defense Premium ISS Bundle E, for $124.99. This $70 mail-in rebate cuts it to $34.99. With around $4 for shipping, that's $0.02/GB. This hard drive features a maximum data transfer rate of 480Mb/s. The security software features mobile security and online backup. Rebates end April 30th & April 26th.
http://static.highspeedbackbone.net/rebates/TDI-10199.PDF - $70 rebate, Exp 04/30/13
http://static.highspeedbackbone.net/rebates/TD-9349%20(US).pdf - $20 rebate, Exp 04/26/13
Note that in order to redeem the rebate, you'll need to activate the Total Defense software, which involves providing your credit card information. However, you can cancel the service at any time within the first year without any additional charges.