Newegg offers the Icy Dock Flex-Fit Trio 5.25" Adapter/Bracket, model no. MB343SP, for $5.99 with free shipping. That's the lowest total price we've seen and a current best by a buck. It allows two 2.5" drives and one 3.5" drive to be installed in a single 5.25" drive bay and includes a snap-off front dust cover.