Newegg offers the TP-LINK AV Nano Powerline Adapter Starter Kit, model no. TL-PA4010KIT, for $39.99. Coupon code "EMCWHWD84" cuts it to $22.99. With free shipping, that's tied with yesterday's expired mention as the lowest total price we've seen for this kit. (It's also a current price low by $13.) These adapters allow you to create a network using your home's existing electrical wiring and feature speeds up to 500Mbps.