Cisco offers its factory-refurbished Linksys Cisco AE2500 High Performance Dual-Band 802.11n Wireless USB Adapter for $16.99. In-cart, it drops to $13.76. With free shipping, that's the lowest total price we could find by $4, outside of the price below. Sales tax is added where applicable. It features WPA2 security, data transfer rates of up to 300 Mbps, and more. A 90-day Linksys warranty applies.

A close price: Electronica Direct via Amazon has it for $14.99 with free shipping.