I use Adam and Eve or HustlerHollywood. You can usually find some good bargains on AE, they have a pretty good selection from different companies and will throw in some freebies with your order. HH is great selection wise, but can be pricey, and they ship through Effex Media which I have never had a problem with.

Video Age sucks. Haven't used them in years. Not much of a selection, mostly Vivid movies and their 4 on 1 DVDs are crap--always cut short to fit on the DVD.