TP-Link 150Mbps 802.11n WiFi Range Extender for $20 + free shipping
Newegg offers the TP-Link 150Mbps 802.11n Universal WiFi Range Extender, model no. TL-WA750RE, for $22.99. Coupon code "EMCPBWF58" cuts it to $19.99. With free shipping, that's tied with last month's mention and the lowest total price we could find by $3. Deal ends August 20.
2 very similar deals were also reported by some other sources: