JC really are suuuuper accommodating. I was considering a Panier by them and asked them about sizing, and they were ready to help me make a custom sized bag. I ultimately decided I didn't want another shoulder bag, but they did offer to quote me the cost. They recommended I make an order of 3+ bags if I wanted to customize the size to help break down the price; here's what they said exactly:
"The price will be consequent because of the development, in this case it would be better to order a minimum quantity of three, to reduce the costs for the study and development."
A small company that can work with you on exactly what you want is a beautiful thing. I can't wait to get one some day, but at the moment it does seem rather cost prohibitive for me!
Preloved is very cheap!