There are several dealers in the USA who sell the Pedersoli Continental Duelling or Match pistols. "No second place" provided a link for Cabela's.
If you are looking for a similar pistol in a custom version, I would recommend you check with
The Gun Works in Oregon. The link will take you to their percussion "English Pistol," which, despite the name, looks very similar to Pedersoli's "Continental" pistols. They ask $625 for these pistols, which I think have L&R locks and Oregon barrels. They have a "used" one in unfired condition (probably built on spec) in .50 caliber for sale right now. I don't know anything about their builders, nor do I know how long it would take to get a pistol built if you ordered one made to your specifications. Mike Nesbitt reviewed a .40 caliber version of The Gun Works' English pistol in
Muzzleloader magazine a few months ago, and gave it very high marks. The Gun Works also has a NIB Pedersoli Continental Dueling Pistol for sale right now for $495. Check it out here:
Continental Percussion .45 Caliber
With all of that said, there are probably a lot of builders out there who could make a similar pistol for you. I would recommend that you check ads in
Muzzleloader magazine and make some calls, if you want a specific lock or barrel.
Good luck!
Notchy Bob