I have a pretty good stock of new and used normandy/maillard parts. If you only need one cone, I can send you a used one in excellent condition with no pitting for the cost of shipping. I also have some maillard NOS QR front axels with cones if you want to buy one.

Other sources are Yellow Jersey in Madision WI. They have some NOS maillard hubs that are a bit pricey at $20 if you only need the cones. They also offer an asian substitute which is close but requires a bit of attention to spacing.

Ebay is also a great source for Normandy stuff.

Email me if interested in that cone.