Belkin Linksys 802.11n Wireless Dual Band USB Adapter for $30 + free shipping
Voodublu via eBay offers the Belkin Linksys 802.11n Wireless Mini AC580 Dual Band USB Adapter, model no. AE6000, for $29.99 with free shipping. That's the lowest total price we could find by $26. Features include a maximum speed of 430Mbps, dual-band functionality, and WEP/WPA/WPA2 encryption.