Newegg offers the Trendnet 500Mb/s Powerline AV2 Ethernet Adapter Kit, model no. TPL-408E2K, for $65.99. Coupon code "EMCEKHE47" cuts it to $34.99. With free shipping, that's the lowest total price we could find by $27. This plug-and-play Ethernet kit uses your existing electrical outlets to create a secure 500Mb/s high-speed building-wide network. Deal ends July 6.
Update: Coupon code corrected.