Newegg offers the Netgear Powerline 1-Port Essentials Edition Ethernet Network Adapter Kit, model no. XAVB5221-100PAS, for $39.99. Coupon code "EMCASKX55" cuts the price to $29.99. With free shipping, that's tied with our February mention and the lowest total price we could find by $15. These adapters plug into a wall power outlet to expand your home network without having to run Ethernet cables through your house and feature data transfer rates up to 500Mbps. Deal ends May 25.