I don't often have much to contribute, but can offer a couple of places:

http://emeraldforestxylitol.com/

For Agave nectar:
http://www.somethingbetternaturalfoods.com/index.html   I get it by the gallon, 
for $28
I also use Sucanat in baking.

Beth H
  ----- Original Message ----- 

  Also, try Whole Foods, or any other halfway decent sized health food store. 
If all else fails, 
  
http://www.vitaminshoppe.com/search/en/query.jsp?q=agave&intsource2=main&tab_selection=vitamins&x=22&y=12