Newegg offers the Trendnet 500Mb/s Powerline AV Ethernet Adapter Kit, model no. TPL-406E2K, for $35.99. Coupon code "EMCELFN47" drops it to $19.99. With free shipping, that's tied with our mention from last June as the best price we've seen. (It's also a current low by $16.). This plug-and-play Ethernet kit uses your existing electrical outlets to create a secure 500Mbps high-speed, building-wide network. Deal ends July 21.