Newegg offers the refurbished Netgear Dual Band 802.11ac Wireless Adapter, model no. A6200-100NAR, for $27.99. Coupon code "EMCASAV29" cuts it to $19.59. With free shipping, that's $30 under the lowest total price we could find for a new unit. It features data transfer rates of up to 300 MB/s. Deal ends May 10.

A 1-year warranty applies, but it is unclear who backs it.