I feel the need to contribute. This has been a subject I have followed closely.
Indian government regulations have banned export of Mysore Sandalwood, due to overharvesting. It is considered "endangered". Period.
Here is a great link on a release (with some notes and history) from Serge Lutens - http://www.perfumeniche.com/content/...ng-july-6-2012
That is one very clear-cut example. Another one outside of niche is from the house of Givenchy. Up to the last formulation of Monsieur de Givenchy in the squared bottle, Sandalwood was used (Vintage used Mysore Sandalwood, specifically). I have some of both and the quality is higher in Vintage overall (a touch of powdery civet may be in there too, but the creaminess of the sandalwood is gorgeous). The later reformulation still has a nice base note of sandalwood - but it is less in quantity. I cannot confirm whether or not it is Mysore.
However, in 2007 (before the ban, but with sandalwood prices going steadily up), the house of Givenchy in their Les Parfums Mythiques release actually got rid of sandalwood altogether - not just switching to Australian essential oil. It actually has Hinoki Wood. I have not tried the fragrance, personally, but I am a purist and adore the Vintage Monsieur de Givenchy.
Hinoki Wood, itself is actually a very interesting and rather rare, precious wood as well - so I am not knocking Givenchy as a house. Instead of going to cheap sandalwood (which indicates that perhaps the last formulation before still had Mysore sandalwod), they opted for a higher quality wood that would add more dimension to the scent. An interesting write-up on Hinoki Wood:
Hinoki is one of the most prized types of wood in Japan. This tree is a type of a cypress that grows only in this part of the world where it is considered a sacred wood. The wood of this tree is nicely lemon-like scented and distinguished by its light color and straight grain. Due to its exquisite features, hinoki is for centuries used for palaces, temples, and shrines. Hinoki is also popular as ornamental tree in all temperate climates of the world.
This conversation, not to hijack it, is actually more (to me) about what perfumers are doing in response to the ban on Mysore...
Here is an online, essential oil seller who kept Mysore Sandalwood for 3 years (Aged) and this was offered until late last year (10ml - $65!). The foresight has been there as the Indian government was reducing the amount allowed over time until the ban was put into effect. http://www.scents-of-earth.com/mysore-oil.html
Great thread - thank you for posting.