Customer: I’m looking for ::Insert description of item we don’t have anything even close to.:: would ::item:: be a good match?
Me: No. ::item:: is really nothing like what you are looking for, but we could run up a custom quote for you.
Customer: No, my customer is OUT of ::non-existent-box:: and needs more NOW.
What I do not say: Well, obviously it already exists somewhere. You can’t just ask them where they bought it last?
What I do say: I’m sorry, but we don’t have anything that matches what you’re looking for. Here’s the info to begin a custom quote request, if you want to go that direction.
Customer: Allright. I’ll order samples of ::item:: anyway, just to check them out.
Me: You have a good day.

We’re not like a shoe store. There’s no special back room where we’re keeping the one item you really really want. If it’s not listed, we don’t have it. We may be able to magic it up out of nothing, but that does take time and money.