With 16months of vaping and counting, I've tried many e-juice vendors, and have settled on these top 5...in no particular order, except for the 5th one.
Backwoods Brew
FSUSA
Elixirjuice
Vapors Kitchen
Gourmet Vapor (simply because you can create your own flavors, but they are my 5th favorite)
The key is to experiment, and buy small bottles. Once you have your own favorite, look for sales, and buy big.
hope this helps.
VIPOD