Monoprice 9920

Powerline Converter - HDStream Kit 200Mbps On Monoprice
 * Kit is $49.95 as of 2013-05-06, so about $30 each

I am going to assume that this a Tenda P200 based on specs, appearance (somewhat, one of the Monoprice pics looks a bit off), and OUI (again per the Monoprice pics).