B&H Photo-Video offers the Western Digital 500GB Elements SE USB 3.0 Portable Hard Drive, model no. WDBPCK5000ABK-NESN, for $48.49 with free shipping. That's $0.10/GB, a buck under our mention from five days ago (which required a rebate), and the lowest total price we could find by $5, outside the deal below. It features a maximum data transfer rate of 5Gb/s. Deal ends June 8.
A close price: newegg offers it for $49.99 with free shipping. Deal ends today.
WD Elements SE 500GB USB 3.0 Portable Hard Drive - USB 3.0 - WDBPCK5000ABK-NESN is also available at these stores