Amazon has the Seagate 16TB Expansion Desktop USB 3.0 External Hard Disk Drive (STEB16000402) for $309 with free shipping. Same price at B&H Photo Video. Includes a 4' USB 3.0 cable and a power adapter.
$10 off Select Purchases $50+ and $20 off $100+. Discount reflected at final checkout. Ends today. Staples has the Seagate Expansion 2TB External USB 3.0 Portable Hard Drive (STEA2000400) for $57 - $10 off with code 20783 [Exp 6/28] = $47 with free shipping.
Newegg has the Seagate EXOS X12 Enterprise Capacity 12TB 7200 RPM SATA 6Gb/s 256MB Helium 3.5" Hard Drive (ST12000NM0007) for $300 - $15 off with coupon code EMCDKDR35 [Exp 5/11] = $285 with free shipping.
Discount reflected at final checkout. Staples has the Seagate Backup Plus Hub 8TB External USB 3.0 Desktop Hard Drive Storage (STEL8000100) for $152 - $15 off with code 98750 [Exp 5/8] - extra $15 off with stackable code 95615 in cart = $122 with free shipping.
Newegg has the Seagate Exos X14 Enterprise 14TB 7200 RPM 512e/4Kn 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive (ST14000NM0018) for $330 - $20 off with coupon code EMCDKDG43 [Exp 5/3] = $310 with free shipping.