********** also stocks Khan el Khalil now as well.
I picked up my glycerin at a Whole Foods. Although it is a small bottle it goes a long way since I only use a 1/4teaspoon for a bowl of Zag or Desi. Also another thing to look into is a light/amber molasses. Molasses is the second ingredient that helps preserve the tobacco along with the glycerin. Hajo posted an article about molasses vs. honey(http://www.hookahpro.com/forum/showthread.php?t=10088
). Make sure it is an unsulphered molasses and try to avoid blackstrap molasses. Most health stores will stock blackstrap because it has the lowest caloric content of different types but will be far too bitter and overwhelm the tastes of the tobacco.