Vizo Technology Luxon 3.5" HDD Enclosure
 

"Now, let's consider power. I don't particularly care for getting power by USB, and that isn't an option here if you are using SATA interface. An internal power supply causes a few problems. It adds to the size and weight of the enclosure, plus adds heat. Vizo decided on an external AC adapter, and was kind enough not to use a "wall wort" style."
http://www.ocia.net/reviews/viso/page1.shtml