I read this on the website of Enfleurage in NYC, which sells essential oils:
"This is the closest to real Indian sandalwood that we have seen in ages. In fact, botanically it is the same, Santalun album. The difference is that it's grown in Indonesia. Usually sandalwood oils from other places are a poor and sad imitation of the past warm voluptuousness of delicious Indian oil. This Indonisian retains some the past glory of Indian Mysore sandalwood oil."
They have 2ml and 5ml vials of this Indonesian sandalwood they sell. I am not affiliated but have bought from them at their shop.