Source for new french doors

Hello–

I wonder if anyone has suggestions for places to ask for quotes to get new custom made french doors. My co-op building needs to replace the french doors that lead open out from the living rooms onto the fire-escape in ten of the apartments. we had a quote that seemed fantastically high (some 4000+ a door.)They are ten panel french doors. but the size is not standard which is the issue. if you have knowledge of any suppliers please let me know,

thanks….