Here's a few I use. I still haven't found a company where I feel that all of their products are of the highest quality but there's a select few who I trust for most of my stuff
http://www.simplers.com/
a great source for all around stuff.
http://www.auracacia.com/auracacia/art.h…
Is a larger company but they have the facilities to do oil testing to make sure what they are getting is the real stuff. They also have a field staff that visits the growers around the world to guarantee the quality.
http://www.floracopeia.com/
This site is great for resin based oils and old world oils like Frankincense, Myrrh and attar's. David Crow, the owner, personally visits the countries and also helps establish growing and distilling communities so these out of the way places have a source of income.
http://www.veriditasbotanicals.com/oils_…
If I was buying in bulk this site would be the only one I'd use. This woman is an exceptional source. Otherwise I don't believe she sells in small quantities
www.mountainroseherbs.com
I get some bulk herbs here and they have a good selection of oils but this is not my first choice. I usually buy Lavender and Tee Tree from them as they are abundant and easy to harvest and distill.
i used to buy from Young Living, but I don't care for the pyramid distribution concept. To buy you need to sign on as a distributor and who ever sponsors you gets a cut of the profits. I've also heard too many stories about how some oils are below quality. But that's my view.
If you are interested in buying true sandalwood, It is being grown and distilled in Australia. Most sandalwoods out there are fake unless you can get a guarantee from them that it is true sandalwood. From my understanding India has been over harvested and has had nothing exported in years.
When buying Lavender, look for Lavendula angustifolia as this is the true most therapeutic version of lavender. Lavendin and Spike lavender are less therapeutic
Hope this helps