Before they all sell out, Tradex, a banner advertiser has Model 10, S&W barrels, marked 38S&W for sale at a very good price, new old stock, still in the wrap.
The profile may not be the same as your pistol's barrel but the bores are the proper diameter and any smith with some common sense can easily fit one to your pistol.
If you don't like the cartridge marking, take it to an engraver and get it changed.
Your next best option is to go through a broker and get one from Numrich.
As mentioned, the OP assumes we know what type/model pistol he has. What do you want to bet he doesn't even bother to check back in to read the replies??