It is usually best to email them; it might take a day to get back to you. They stay very busy and give a lot of personal service. When a client is in their "office" they do not take phone calls. [email protected], or call (972) 315-9086
EDIT: I see now you are looking for the 01911 carbonia blue and your best bet is the auctions and forums like bluetooth and these guys said. If you become interested in the current production reproduction 01918 WWI dealers like Sporting Arms are a good bet also.