IMHO this is the best place to get high quality Salvia leaves, extract, and all your herbal needs.
http://www.sagewisdom.org/salviashop.htmlhttp://www.sagewisdom.org/
I have purchased many times from this store with no problems ever, not with shipping or quality. As far as Salvia Divinorum goes you dont have to buy just the tar extract, you can buy the standardized increased potency leaves which can then be smoked or used as a quid (oral application). There are ways and methods to both and as Rockydog said "Salvia Divinorum is not to be taken lightly", this is very true. Not everyone that tries Salvia experiences desired effects. This is a hypnotic, hallucinegenic plant that was used by the "Shaman" or medicine men for centuries to see into the future, or to detect illness or thievery amongst there tribes. I suggest that you spiritually cleanse your home of any negativity before embarking on a Salvia trip, and please, please start out slow. There is no need to buy 25x or 50x extract for your first trip start with the 10x strength and go from there. You may find you dont like the effects, and please always have a "Sober Sitter"...someone who can watch over you but will not interfere with your trip (i.e., mess with you). People have been known to wander on Salvia and have even walked out of open windows. As with any drug legal or not legal, research, research, research!!! Knowledge is the first key to opening ones mind! youc an get very useful info on this topic and many other at:
http://www.erowid.org/plants/salvia/salvia.shtml
Peace Out