Carl Goldberg kits that people continue to purchase are still in production. Please remember that if enough modelers don't buy an item, it cannot be kept in production, no matter how much you like them.
That being said, here's the latest version of the Falcon series of airplanes:
http://www.carlgoldbergproducts.com/.../gpma1940.html
These parts can be ordered through any hobby retailer who sells Great Planes kits and accessories.