I have always gotten much better prices purchasing at auctions than I have ever seen from a dealer. Considering that a local auction might be a problem, perhaps online auctions would work well for you? The best values are at local auctions without internet bidding, but I still see reasonable prices on things that are relatively more common.
The photos aren't the best, but this one looks decent and I would bet it will sale for less than your top dollar. You could at least keep an eye on it just to get an idea what something might cost you if you went this route. Considering it's a west coast auction it will likely bring less money than something on the east coast and the shipping wouldn't be as much for you. If you do bid, just make sure you take into account the buyer's premium and shipping cost.
19JW-10 BRASS MOUNTED ENFIELD | Firearms & Military Artifacts Firearms Percussions | Auctions Online | ProxibidBrass mounted Enfield 58 percussion rifled musket dated 1863 with near excellent socket bayonet and very good + leather scabbard, varnished wood stock with 3 barrel bands and metal ramrod; overall very good condition with crisp action, sharp markings and good wood overall; modern leather...www.proxibid.com
I don't know if the op took my advice or not, but this ended up selling for $720 plus shipping. Cheaper than a reproduction!