Trident Trikes Gossamer SL trike is currently being built for special orders as I understand. I believe they have 6 or 7 built and delivered. I'm not sure of the price. I had a chance to check it out at RCC last October. I actually lifted it over my head with one arm!
The weight is 21 pounds! And I believe it is built out of carbon fiber and not Chrome Moly steel.