TP-Link AV600 Powerline WiFi Extender - N300 WiFi, Add-on Single Adapter, Ethernet over Powerline, Plug & Play, Compatible with all TP-Link powerline adapters with different speed(TL-WPA4220) - Newegg.com
TP-Link AV600 Powerline Ethernet Adapter - Plug&Play, Power Saving... - NWCA Inc.
TP-Link TL-PA7017 tlpa7017 Av1000 Gigabit Powerline Adapter for $29.28.