All the Ubertis sold here are single action. They do make a copy of the Colt Detective Special but it is not imported to USA.
At one time High Standard made the Double Nine, a double action .22 faked up to look like a SAA, and H&R had some, too.
The Mattell Fanner 50 was double action, too.
Sorry, if you want a double action revolver you are going to have to get a "modern" one on a design only a hundred years old.