I have a batch of 72V controllers direct from the factory that I'm selling for a very reasonable £35 + £4.50 p&p per unit.
They're exactly the same brand ("Hua Tong") as the first one I got from China which I am now using as a spare (see my blog).
Nice and fresh, too :)
(at time of writing)
Ego(Saiting/Xinling) Electric Scooter Blog & Upgrade Guide http://zenid10.wordpress.com/category/4-how-to-guide/4-2-72v-upgrade/