Fry's Electronics offers the Bytecc 3.5" Serial ATA to SuperSpeed USB 3.0 External Hard Drive Enclosure, model no. HD-35SU3-BK, for $21. This $21 mail-in rebate slices it to $0. Opt for in-store pickupto avoid the $6.99 shipping charge. That's the best deal we've seen for a USB 3.0 hard drive enclosure. (It's a current price low by $30.) This enclosure supports hard drives up to 2TB and features 5Gbps transfer speeds and an aluminum cover. Deal ends January 17.
Update: Shipping is no longer available. You can still order online and pick it up in-store.