Sacha wrote:
Does anyone know of a supplier of these? I've given a customer the list
from the Plant Finder but none has it.

It has always been extremely rare in the UK and normally only seen in
country house estates and arboreta. Paignton Zoo have it, but I'm not
sure how long ago it was planted. An enquiry to their plants chappy
may reveal a source. Failing that, I suspect your customer will have
to extend his search to France. Although it is many years ago, I
remember montezumae being quite widely available amongst the wholesale
nurseries over there.