Hi, Leah. This is like any antique. It usually doesn't have a lot of intrinsic value so it is just worth what someone is willing to pay for it. You can check architectural antique sites on the board and you may get some idea of what the same thing salvaged and ready to ship to a customer with a hefty profit in the price is going for. Or you can check your home center to see what fairly comparable moldings are worth. Personally, I would offer what you thought the worth of any extra time for the demolition work and crews would be worth because if you don't get it now it will just be hauled off the the dump site.