NetComm NP204 +

120
NetComm NP204 (Twin Pack) Powerline Adaptor $69 @MSY (Online/in Store)

expired NetComm NP204 (Twin Pack) Powerline Adaptor $69 @MSY (Online/in Store)

Next cheapest found is $89. As per website: Transfer the Internet around your house using the existing network of power lines High speed data rates of up to 200Mbps