newegg offers the Kingwin Internal Dual 2.5" to 3.5" Hard Drive Mounting Kit (pictured), model no. HDM-227, for $3. This $3 mail-in rebate cuts it to $0. With free shipping, that's the lowest total price we could find by $6. It allows most 2.5" hard drives to fit into a 3.5" drive bay. Rebate expires May 31.

Of note, newegg also offers the Arctic Cooling Alpine 7 PRO CPU Cooler, model no. A7P-75000023, for $20.99. This $20.99 mail-in rebate drops it to $0. With $3.99 for shipping, that's a buck under last week's mention and the lowest total price we could find by $18, although we saw it for $4 less in February. It features a 92mm fan, 500 to 2,000 rpm, and more. It supports Intel Socket 1155 and 1156 up to 90 watts. Rebate expires May 9.