Amazon.co.jp: TRENDnet Just Plug Into Electrical Outlet for easy PLC Kit Power Line 200 AV Nano PLC Adapter Kit/Powerline 200 AV Nano Adapter Kit [TPL – tpl-308e2 K-a] : Computers
Amazon.com: TP-Link AV500 Nano Powerline Adapter, up to 500Mbps (TL-PA4010) : Electronics