I got one with my 1860 Army when I bought it 20+ years ago. I still see them in catalogs, but I guess they go fast. I'd love to get one for my Dragoon, but the only repro I've ever seen was in a cased set commerative that someone put out 10 years ago, and understandably they guy didn't want to break the set. I just don't understand why Uberti won't make them when most of their Dragoons are set up for them. I wonder if the ATF is calling them SBRs even though they're muzzle loaders?
I have seen a few original ones if you want to spend $15K and up!