Any good sailmaker will make one. Just explain what you want.
You can have a mylar/carbo sail made and this one (also mylar/spectra/kevlar) will work in both light winds and in normal conditions. A Cuben Fibre will do the job as well.
Alternatively, if you are looking for economy solutions, then you can have a sail made in Contender Stormlite (3.4 or 4.6oz).
In my experience, a normal weight main, if designed to be made full (cunningham, foot pocket, etc.) in connection with a Code 0 / MPR / Gennaker
is a much cheaper and very efficient solution for light conditions.