Also, depending on what part of Washington State you're in, you probably can't swing a cat without hitting one of those "hippy-food" stores with words like "Fox Fire Natural Whole Organic" in the name. They usually carry VG, but you'll never find it without asking the clerk. Make sure the bottle says "USP", "100% pure", and "Vegetable Glycerin".
I found "Now" brand in a 16 oz. bottle for like $9, and 16 oz. is a LOT of VG.