Yes, there are three or four makers of suitable coaches for this model.
The G1 newsletter contains all of them, and as I am presently in Cannon Beach Oregon, I can't give you the details - no doubt Mr Pullen will fill in the details.¬* Depending on the era you wish to portray, the wonderful teak LNER coaches from one company will set you back in the region of $1800-2000 per unit, while an economy coach in blood and custard BR scheme will set you back around $600-800.¬*
I understand that David Leach has hung up his tools pro tem, but Alan Wright in Ontario may also be in the running for a moderatley-priced coach - peraps around $700 or so.
The full pre-war FS train consist was usually 11 or 12 coaches, by the way.
tac in Oregon