I like ecigxpress, mostly get flavorings from them so far. They carry the large bottles of FlavourArt and I use a lot, they also have the Signature and Capella lines, among others. Their service is excellent
I do get my Capella from Capella directly though, I use the 4 oz bottles of my favorites from them, and they have bulk discounts. Takes a bit longer to get the 4 oz bottles on the road, but not much. Cost savings are excellent.
They also have a 5 flavors for 19.95 deal where the normal price is 5.95 per 13ml bottle, and they're closer to me.