You can get pure VG from health food stores, but if you want a place to get pure PG or VG online plus all the "supplies" (dropper bottles, pipettes, etc.) try juicyliquid.com.
Your next stop will be lorannoils.com to buy flavorings, click on "Super Strength Candy Oils" (they are not actually oils but that is what they call them). The flavors have to be water soluable and without food coloring or sugar. Do not even bother with the flavorings in the grocery store as you will not get flavor--they simply are not strong enough. Here is a list of safe flavors (originally reviewed by Sun Vaporer):
Apple (Medium--Very good)
Bavarian Creme (Strong--Very Good)
Black Walnut (felt lke a squirrel)
Blackberry (Strong--Very good
Brandy (Got lit of this one)
Bubble Gum (Strong--Very Good)
Butter (went looking for some bread to put it on)
Butter Rum (Strong--Very good)
Champagne (Rang in 09 with it--will not in 2010!!)
Cheesecake (strong--very good)
Chocolate Hazelnut (Strong but not too little on the Choc)
Cinnamon Roll (Medium--Very good)
Coconut (strong --Very Good)
Cotton Candy(Strong--Very good)
Cranberry (Strong--very good)
English Toffee (Strong--Very Good)
Guava (did not bother to try--yuck)
Honey (The bees loved it--not me)
Horehound (Strong--taste like a cough drop)
Key Lime (never cared for it so I took a pass)
Lemonade (Strong--very sweet)
Licorice (if you like it--go for it)
Mango (Good to mix with the Strawberry)
Marshmallow (weak)
Mint Chocolate Chip (disappoints but try anyway)
Pecan (not exactly nuts over this one but Strong)
Pina Colada (strong--very good)
Pineapple (Good to mix with the Pina Colada!!)
Pistachio (passed up on it
Plum (not any time soon for me)
Pomegranate (Take a pass--weak)
Praline (needed the cream)
Pralines And Cream (Strong--A Winner)
Sassafras (Medium--Not exactly Root beer as you would Expect)
Strawberry Kiwi (Look out Hawaii--nice)
Teaberry (Storng--very good)
Tropical Punch (Strong--puts you in Summer Mode!!)
Vanilla Butternut (the best you can do for a Vanilla)
Use 6-8 ml of Lorann in a 30ml batch. If using VG you may want to cut it with a little distilled water (NOT tap water), about 1-2ml per 30 ml batch.