I ran into this problem in my early brokering days. I had a jewelry store client what was going to do a “By Invitation Only Show”. They wanted the invitations to be unique, eye catching, and as upscale and sophisticated as their jewelry store. Like I said, I was new to brokering and I had no idea that the lovely colored papers shown in the swatch books were not readily available.
Over thirty years ago there were more colors available then there are today, but even back then, not all colors were available. I showed the client the swatch books and of course they picked the more obscure colors. To check pricing, I called the distributor and was told that the color selected was a mill order item only, and would take 6 weeks to manufacture and ship (which would have gotten the paper to me about a week after their sale was over) and it would cost $840 plus freight.