Dealmac - Today's Edition, 2014-03-12 23:17 EDT Seagate 4TB Backup Plus USB 3.0 External Hard Drive for $140 + free shipping
Ending March 13 at 3 am ET, Newegg continues to offer the Seagate 4TB Backup Plus USB 3.0 External Hard Drive, model no. STCA4000100, for $149.99. Coupon code "EMCPGPD23" cuts it to $139.99. With free shipping, that's tied with last week's mention and the lowest total price we could find by $10. It features two backup scheduling options and social network sharing.

Tech Bargains, 2014-03-12 08:30 EDT Seagate Backup Plus 4TB USB 3.0 External Hard Drive $139.99 Free Shipping at Newegg
Newegg Codes

Tech Bargains, 2014-03-10 17:00 EDT Seagate Backup Plus Slim 1TB USB 3.0 Portable Hard Drive $59.99 Free Shipping at Newegg
Newegg Coupons

Fatwallet Hot Deals, 2014-03-07 21:54 EST Seagate Backup Plus 3TB USB 3.0 3.5" Desktop Hard Drive ($89.99 was $169.99) @ Newegg

Tech Bargains, 2014-03-07 08:10 EST Seagate Expansion 3TB USB 3.0 External Hard Drive $99.99 Free Shipping at Buy.com
Buy.com Coupon

Tech Bargains, 2014-03-07 04:10 EST Seagate Backup Plus 3TB USB 3.0 External Hard Drive $94.99 at Newegg
Newegg Promotions

Dealnews - Today's Edition, 2014-03-06 18:46 EST Seagate 4TB Backup Plus USB 3.0 External Hard Drive for $140 + free shipping
For its newsletter subscribers, Newegg offers the Seagate 4TB Backup Plus USB 3.0 External Hard Drive, model no. STCA4000100, for $149.99. Coupon code "EMCPGPD23" cuts it to $139.99. With free shipping, that's tied with our January mention and the lowest total price we could find by $9. It features two backup scheduling options and social network sharing. Deal ends March 12.

Tech Bargains, 2014-03-06 06:55 EST Seagate Backup Plus 4TB USB 3.0 External Hard Drive $139.99 Free Shipping at Newegg
Newegg Sales

Uberi, 2014-03-08 03:18 EST Seagate STCA3000101 Backup Plus 3TB USB 3.0 External Hard Drive for $89.99 Shipped
Seagate STCA3000101 Backup Plus 3TB USB 3.0 External Hard Drive for $89.99 shipped after code EMCPGPC42.  Here is a screenshot for your reference.  It uses SuperSpeed USB 3.0 port, which is backwards compatible with USB 2.0 for additional system compatibility.