CrossRoads Mower in McMurray, PA is a Ferris dealer. I think they do a fair amount of business in the Ferris line. They are a sizable dealer, handling Toro, Wright, Echo, Shindy, Snapper, and some other products.
I don't find a web page, but punch in the address on Google for directions,
611 E McMurray Rd, Canonsburg, PA 15317
[Canonsburg and McMurray are interchangeable with this address, don't be confused]
Drive up I-79, or I-70 to Washington, then up Rt 19 to McMurray (10? miles), E McMurray Rd to their location (3? miles).
If calling, ask for Tommy.