Newegg offers the Trendnet 500Mb/s Powerline AV Ethernet Adapter Kit, model no. TPL-406E2K, for $39.99. Coupon code "EMCASKK29" cuts it to $24.99. With free shipping, that's the lowest total price we could find by $7, although we saw it for $5 less last winter. This plug-and-play Ethernet kit uses your existing electrical outlets to create a secure 500Mbps high-speed building-wide network. Deal ends May 12.