Simpsons Ltd has a *lot* of old guns in their inventory, and the condition varies widely. I live fairly close, and deal with them face-to-face in their store, so not really up on how accurate their website descriptions might/might not be.
If you're anywhere near Galesburg, it's worth a stop just because of the sheer number and variety of the guns they have in inventory. When I looked at their website about a week ago they had three, THREE, Webley-Fosberrys in.
