Cavalry 3.5″ & 2.5″ 2-Bay External Hard Drive Dock for $21.99 shipped after a $10 rebate.  Here is a screenshot for your reference.  This is very convenient for those who work with a lot of hard drives on a regular basis.  For the technically inclined, this docking station also features disk spanning (JBOD) to combine two drives to create single large total volume.  This 2-bay SATA Drive Dock usually sells for about $35.