There are 2 places that I know that have a good number of barrels on hand at most times. Mann & Son Sporting Goods (Since 1946) 618.357.2911 and Wright's Gunsmiths 618.357.8933.
If I can be of help "scouting out one" just let me know and I'll do my best to be of help.
Just let me know.
Thanks,
Clark