Staples is offering Seagate Backup Plus Portable Hard Drive, 4TB (STDR4000100) for $119.99 plus free shipping:
http://www.staples.com/Seagate-Backup-Plus-Portable-Hard-Drive-4TB-STDR4000100/product_1868706
http://www.staples.com/Seagate-Backup-Plus-Portable-Hard-Drive-4TB-STDR4000100/product_1868706