Great Northern Collectibles
The Society regrets we cannot answer your questions on GN and railroad collectibles and antiques. Your best bet would be to join the GN Online Discussion group on Yahoo! and post your collectibles question there. We provide the following links only as a courtesy so you may look elsewhere.
Bob Waller maintains the NMRA Directory of World Wide Rail Sites. This site has a section of links to various web sites dealing with railroadana, collectibles and other items for sale.
Another good source of collectible links is on Railserve site. From this link, go down and click on the "Antiques & Collectibles" link.