newegg offers the Kingwin 2.5" to 3.5" Hard Drive Metal Mounting Kit, model no. HDM-225, for $5. This $5 mail-in rebate cuts it to $0. With free shipping, that's tied with our February mention as the lowest total price we've seen for a 2.5" to 3.5" HDD mounting kit. (It's also a current price low for this model by $7.) It allows most 2.5" hard drives to fit into a 3.5" drive bay. Deal ends March 31.