Quest Specialty Lab in Largo FL was the first to offer it and specializes in difficult prescriptions like high power, high prism, Franklin segs, sectoral prisms, prism segs, pilot lenses, dive masks,...
This is from a 12 plus year old lens guide. Check with Zeiss to see if they still have these available. Quality was great for creating tint samples, edger calibration, etc.
You might want to check online retailers that specialize in optical supplies or scientific equipment. Additionally, reaching out to local optometry schools or eyewear manufacturers could lead to...