The Electrobike Pi is $7,500 at Electrobike dealers. (DWR sells it for $8000)
That's a bit expensive for an electric bike. But you get a very sophisticated design for your money.
The Pi batteries take 3 hours to fully charge, which is good for 30 miles at 20 mph. The electric motor is inside the hub of the rear wheel, and the batteries and electronics are inside the frame. Very simple and clean.
And since hotrod mopeds are the current craze in San Francisco, check out the 30hp Pi X.