Other World Computing offers the open-box HGST Touro Mobile USB 3.0 Portable 2.5" SATA Hard Drive Enclosure, model no. ENC25USB3ABK, for $4.75 plus $3.59 for shipping. That's tied with our mention from a week ago as the best price we've seen for this enclosure. It's backwards compatible with USB 2.0.

Note: This is an open-box unit, with the original drive removed. (As a result, there is a possibility that the internal clips may be damaged or broken.)