For its newsletter subscribers only, Newegg offers the TRENDnet 500Mbps Powerline AV Ethernet Adapter, model no. TPL-401E, for $55.99. Coupon code "EMCPHWG35" cuts that to $19.99. With free shipping, that's the lowest total price we could find by $36 and beats our mention of a 2-pack from June, which was $22 per item. This plug-and-play adapter uses your existing electrical outlets to create a secure 500Mbps high-speed building-wide network.