Walmart offers the TP-Link 300Mbps 802.11n Universal WiFi Range Extender Kit, model no. TL-WPA4220KIT, for $29.99. Opt for in-store pickup to dodge the $4.97 shipping fee. (Amazon charges the same with free shipping for Prime members.) That's $10 under our Black Friday week mention and the best price we've ever seen for this model. (It's a current low by $20.) It features Ethernet and WPA-PSK / WPA2-PSK encryption.