Best Buy offers the Seagate FreeAgent GoFlex 500GB Portable USB 2.0 External Hard Drive, model no. STAA500101, for $49.99 with free shipping ($0.10/GB). That’s tied with our mention from a week ago as the lowest total price we’ve seen. (It’s a current low by $23.) Sales tax is added where applicable. This 2.5″ drive features an 8MB cache.

Beach Camera offers the Western Digital 2TB Portable USB 3.0 External Hard Drive, model no. WDBY8L0020BBK-NESN, for $179.99. Coupon code “SAVE30″ cuts it to $149.99. With free shipping, that’s $0.07/GB and the lowest total price we could find by $15.

J&R offers the Toshiba Canvio 1TB Portable USB 3.0 External Hard Drive, model no. HDTC610XK3B1, for $79.95 with free shipping ($0.08/GB). That’s pennies under our mention from three weeks ago and the lowest total price we could now find by $3. The enclosed 2.5″ hard drive features an 8MB cache and runs at 5400 rpm.

Best Buy offers the Western Digital My Passport Elite 500GB Portable USB 2.0 External Hard Drive in Metallic Red, model no. WDBAAC5000ARD-NESN, for $59.99 with free shipping ($0.12/GB). That’s the lowest total price we could find in any color by $7. Sales tax is added where applicable. It features 256-bit hardware-based encryption, automatic backup, and WD SmartWare.

Buy.com offers the Iomega 2TB eGo USB 3.0 Desktop External Hard Drive, model no. 34985, in Charcoal Gray for $89.99 with free shipping ($0.04/GB). That’s the lowest total price we’ve seen for an Iomega 2TB USB 3.0 hard drive shipped to your home. (It’s also a current price low by $47.) It features a 3-year warranty.

Of note, the similar Iomega 2TB Prestige USB 3.0 External Hard Drive, model no. 35182, is available for $89.99 with pickup at Fry’s Electronics ($0.04/GB). That’s a price low by $36. Sales tax is added where applicable. It features built-in AES 256-bit hardware encryption, a 1-year subscription of Trend Micro Internet Security, and 3-year warranty.

B&H Photo-Video offers the Western Ditgital Elements SE 1TB USB 3.0 Portable Hard Drive, model no. WDBPCK0010BBK-NESN, for $79 with free shipping. That’s $0.08/GB and the lowest price we could find by $11. It features a maximum data transfer rate of 5Gb/s, backward compatibility with USB 2.0, and more.

MacMall offers the refurbished LaCie Porsche Design P’9221 1TB Portable 3.5″ External USB 2.0 Hard Drive, model no. 9000127, for $69.99 with free shipping ($0.07/GB). That’s tied with our August mention of a LaCie Porsche Design 1TB hard drive and the lowest total price we could find by $6. (It’s also $66 below the lowest total price we could find for a new unit.) This 5,400 rpm hard drive features an aluminum housing designed by F.A. Porsche.

A 180-day warranty applies; however, it’s unclear who supports it.

MacMall offers the refurbished LaCie 2Big Thunderbolt 6TB USB 2.0 External Hard Drive, model no. 9000192, for $369.99 with free shipping ($0.06/GB). That’s $345 under the lowest total price we could find for a new one. This drive runs at 7200 rpm and features an aluminum exterior.

Note: No warranty information is provided.

B&H Photo-Video offers the Western Digital Elements 1.5TB USB 2.0 External Hard Drive, model no. WDBAAU0015HBK-NESN, for $77.95 with free shipping. That’s $0.05/GB, tied with our mention from two weeks ago, and the lowest total price we’ve seen. (It’s a current price low by $23.) This PC-ready drive can be reformatted for use with Macs.