Newegg has the 2-Unit Rosewill RPLC-500KIT Powerline AV Wall-Plug Gigabit Adapter for $60 - $5 rebate
[Exp 2/10] = $55
with free shipping. Similar adapters cost around $100 and up. Features up to 500Mbps powerline speeds, 128-bit AES encryption, and capable of extending up to total of 16 Powerline adapters in one environment.