Those on the board here that have their own authentic road signs. Where did you get them? Connections? ebay? the side of the road?
Yes to one of those.
;)
A couple from eBay, but most straight from a manufacturer.
How much does the average sign cost? Say... an older route marker vs a newer one or something.
I've mostly gotten my signs from eBay or other generous collectors selling their signs. On occasion, I'll see a neat sign in an antique store (like my New Hampshire I-89) and go for it, but that's not too common.