Newegg offers the Linksys AC1200 802.11n Amplify WiFi Dual-Band Range Extender, model no. RE6700, for $88.53. Coupon code "EMCAXNP25" cuts it to $79.99. With free shipping, that's the lowest total price we could find by $6. It simultaneously extends ranges for 2.4GHz and 5GHz bands and features Ethernet and two external antennas.