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Western Digital 4TB WD Blue PC Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 256 MB Cache, 3.5" - WD40EZAXAmazonSAVE $15.53
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Western Digital 4TB WD Blue SA510 SATA Internal Solid State Drive SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 560 MB/s - WDS400T3B0A, BlueAmazon$109.00and up
Western Digital WD 4TB My Passport Portable External Hard Drive with backup software and password protection, Blue - WDBPKJ0040BBL-WESNAmazon & 2 more$159.99
Western Digital® My Passport™ Ultra 4TB Portable External Hard Drive, 64MB Cache, WDBFTM0040BBL-WESN, Blue/BlackOffice Depot$9.99
Miloocul Leather External Hard Drive Case for Western Digital WD Elements/WD My Passport/WD My Passport Ultra Portable Hard Drive Carrying Case of 1TB 2TB 4TB 5TB (Gray&Blue, Single Layer)Amazon