American Science & Surplus is selling residential style electric watt hour meters. Awhile back I picked up this analog one from them for $14, but they also have digital ones for less at their tent sale going on this weekend.  I finally found some time to play with it and I managed to get it working.  I’ll probably turn it into a lamp or something!

Electric Watt Hour Meter from AS&S

Electric Watt Hour Meter Disc

Electric Watt Hour Meter Connections