Amazon offers the Actiontec Powerline 500Mbps Network Adapter Kit, model no. PWR511K01, for $41.99. Clip the $5 off coupon (found directly under the product price) to cut it to $36.99. With free shipping, that's the lowest total price we could find by $5, although it was a buck less last month. This plug-and-play Ethernet kit uses your existing electrical outlets to create a secure 500Mbps high-speed building-wide network.