I know it's not for everyone, but have you considered mixing your own juice? Buying the bottled VG/PG base in the proportions that you want (as well as nicotine level) separately from the concentrated flavors that you like is much more economical. One huge benefit to doing it this way for me is that I can mix only the quantities I want and I can control the flavor. It takes a little getting used to at first, but it's not difficult at all. A good rule of thumb is 3 drops of flavor concentrate for every ml of base. I can then add more flavor if it's light, or add more base if too strong. I usually make larger batches of about 30ml every 2 weeks or so (usually Grape). When you compare the prices when your purchase separate base/flavor and compare that to what it costs to buy pre-mixed juice, you'll understand where they are making their money. I've been buying my base and flavors from e-liq.com because I've yet to run across better prices and the flavors are good although to be honest, I haven't tried much beyond the fruit flavors. You can always buy your flavors from a different vendor if you you don't like a specific site's flavors. You can also buy very small bottles of "sampler" flavor concentrate for just a few bucks to try them out with your base of preference, which avoids tossing out larger bottles of the pre-mixed flavors that you might purchase and decide you don't like.
My bottles of base and flavor live in my refrigerator until I need to mix up another batch, which keeps the juice fresh. I don't buy really big bottles of base or concentrated flavor, but in just the few bottles that I have, I probably have enough to last me 6 months easy (based on my vaping and I DO vape often). Mixing the juice only takes about 5 minutes (I mix a 30ml bottle every couple of weeks or so). I fill my 50ml bottle with 30ml of base and count the drops of flavor into it with a dropper (3 drops per ml of base). I marked a line on my bottle so I don't have to count the drops anymore. When you make that much juice all at once, a few drops heavy or light don't amount to much change in flavor so it doesn't have to be exact, but you can get as crazy as you want with it if your concerned about consistency.
Anyway, doing it this way saves me a lot of money in the long run and gives me the freedom that I want with my flavors. Just my 2 cents.