Welcome to the forum. :wavey:
http://www.budsgunshop.com/catalog/product_info.php/cPath/21_141/products_id/15437
I don't believe Colt is producing any 9mms at this time.
It would all depend on the era in which the pistol was manufactured and its condition. Buying new and converting could very well be more economical.
You can find a Super .38 Government for $731 at Bud's.
http://www.budsgunshop.com/catalog/product_info.php/cPath/21_141/products_id/15437
I don't believe Colt is producing any 9mms at this time.
None of the Colt Super .38s come from the factory with them that I know of, they can be installed though. They can also be removed, depending on the installation method.