EverCool Dual 5.25″ Drive Bay to Triple 3.5″ HDD Cooling Box for $22.69. Shipping is free on orders over $35. If needed, use this Filler Tool to pad the order for free shipping. Here is a screenshot for reference. For the technically inclined, this a convenient way to convert two 5.25″ drive bays so that the same space can house three 3.5″ hard drives.