Dear Jean-Christophe,
Temi is the only (major) tea producer in Sikkim. There are some few small scale farmers who produce as well but its only available in village markets etc.
You can visit Temi-Website (www.sikkimtemitea.com) and while in Sikkim visit their retail shop and drive with a car through their garden (public road). The website offers a contact info service where you will be able to send a special enquires..
Hope this helps.
Jan
