eXpansys offers the TrekStor DataStation Serial ATA 2.5" to USB External Hard Drive Enclosure
, model no. CSE-SIL-DSPXU-S-SU-A, for $9.49
with free shipping
. That's the lowest total price we could find for such a dock by $9. It supports hard drives up to 1.5TB and features a 1-touch backup function.