Mertiline offers the refurbished Logitech Cordless Desktop S520 Wireless Keyboard and Laser Mouse Combo, model no. 920-000922, for $21.99. Coupon code "MLCK418QNL1" drops it to $17.99. With free shipping, that's $7 under our February mention of a new unit and the lowest total price we've ever seen for this bundle. (It's $30 under the lowest total price we could find for a new one today.) The 104-key keyboard features spill resistance and wireless connectivity. The 3-button optical mouse works as a USB or cordless mouse. Coupon expires after 100 uses.

Note: No warranty information is provided.