Shez, I called around for PG and a local, mom-and-pop pharmacy store didn't have it on-hand, but was able to order it for me. I got a pint (472ml) for about $12 one day after they ordered it. I know that Tractor Supply sells a gallon of it (3,785ml) for like $21, which is very reasonable . . . but that's a lot!
+1 efrency on the glycerin. Got that at a local health food store. 4 oz (118 ml) for $5.00.
Hope this helps!