Newegg offers the Seagate Backup Plus 1TB 2.5" USB 3.0 Portable Hard Drive 3-Pack in Black, model no. STBU1000100, for $149.99 with free shipping. At $49.99 per hard drive, that's the lowest total per-unit price we've seen for this model without rebate hassles. (It's also $39 under the best price we could find for purchasing three separately elsewhere.) These drives are compatible with Windows and Mac, they feature a USB 3.0 adapter and are backwards compatible with USB 2.0.