Nazareth: I went to a local health food store -- there are several, even in my relatively small town -- and asked for it. They were out of stock on it, but ordered some. It was about $5 for a good-sized bottle that will last a year or more. It's very useful for cooks and the quality is top grade. Funny, but it's a byproduct of biodiesel production, and, since my personal car by choice is a VW Jetta TDI (diesel), I feel all warm and fuzzy using glyerine. Kinda completes an eco-loop!
Anyhow, my e-cig is still a bit runny as I haven't got the liquid consistency just right yet. Too wet, and it leaks past the filter into the mouthpiece; two thick, and an atomizer might clog. For test purposes, I'm alternating two identical cigs, one using only factory fluid and one exclusively home-made fluid. So far, the factory fluid (as found in original cartridges, not dripped or refilled) is superior in every way but taste -- and taste is a personal preference, I know.
More experimentation lies ahead ...