Tenda 802.11ac Wireless Dual Band USB Adapter for $25 + pickup at MicroCenter
MicroCenter offers the Tenda 802.11ac Wireless Dual Band USB Adapter, model no. W900U, for $24.99. Opt for in-store pickup to dodge the $5.99 shipping charge. That's the lowest price we could find by $20. It supports speeds up to 867Mbps.