http://www.cimandecombat.com/loudbabycart/index2.html
http://www.murnis.com/onlineshop/incense/index.htm
Take a look here. I have never tryied them, but you can try.
My favorite is a Madurese oil from a friend in Indonesia, that is very "heavy" in perfume (the keris smells for months with just some drops) and another one from Solo that is very rare and has some very strange ingredients during it's preparation).
If you believe in the esoteric aspect, use only natural oil.
If you find pure natural fragnant oil, you can put some water and fresh jasmine flowers for some days in a bottle in order to make it less "heavy" in substance.