Amazon offers the Vantec NexStar TX Aluminum 2.5" USB 2.0 Hard Drive Enclosure, model no. NST-210S2-BK, for $7.99 with free shipping. (newegg has it for the same price.) That's the lowest total price we could find by $8. It is compatible with most Mac and PC computers and features a maximum capacity of up to 750GB.