TP-Link RE200 AC750 Dual Band Wi-Fi Range Extender for $19.95 after clipping a $5 coupon as shown in this screenshot. Shipping is free on orders over $49. If needed, use this Filler Tool to pad the order for free shipping. It extends wireless network’s coverage and is compatible with 802.11b/g/n and 802.11ac Wi-Fi devices. Most places have it for about $39.