I've got one of them, and they are still available from several of the importers, including Traditions, and they come in the three common barrel lengths. Don't ask me how I came by it...it was an accident and came in on "one of those deals."
The ejector is there for looks- to make it look like a regular single action army.
There is no way to load it without a loading stand.
I guess they are more targeted toward people in other countries where having cartridge revolvers are more regulated, but percussion revolvers are less regulated or need far less paperwork. Someone must have thought it a good idea to import some into the US. The only drawback to them that I can see is that they are not allowed in sanctioned "SASS" matches (in the US, but are allowed elsewhere in the world), but they're just as fun as any other percussion revolver.