eliquidplanet, Ms Ts Bakery essentials (can choose PG or mix), Cignots Basics, besteciggy, nhaler's high voltage is a mix. If you are looking for VG due to an allergy, it's one thing, but if you are just wanting more vapor, I'd suggest getting a mix. Pure VG liquids have very little flavor compared to PG. Nhaler's mix in it's high voltage liquids have incredible taste, and incredible vapor. Also, pure VG tends to clog up attys due to it's thickness, which requires a little thinning with distilled water which in turn dilutes the taste a little more.
If you want to just try a cheap sample of VG, besteciggy has a pack of 10 3 mls bottles that is cheap.