Oils

Majestic Mountain Sage
This site has a good listing of many extracted oils that you will need to do spellwork or for making those rubbing oils to give as gifts (or keep for yourself). Reasonably priced, of course.

So you want to go hard-core and do extractions yourself? Well, Scott Cunningham suggests that you just buy the extractions and once you see this website you will understand. This site has the most reasonably priced products you need for extraction that I've found anywhere.
Eden Labs
Good luck! Let me know if it works, as I'm still toying with the idea myself.