If you bought at a reputable vendor then ask them to exchange the one that doesn't work. And if you bought auto
batteries, next time you buy a battery or ecigarette buy manual
batteries - much harder to damage or kill
with 0 nicotine the lowest price may be Tasty Vapor 0-nic doublers, 2 oz (60ml) for $10.40
with nicotine, maybe the 50ml bottles of Chinese
juice at Madvapes and their own TopVapor juices are pretty cheap too
With any vendor, I think quality of juices varies. Backwoods Brew and maybe Vaporbomb and Purevapes and Tasty Vapor probably have among the highest percentage of good juices out of their total juices to the point where it just depends on your taste and what you like.
And without spamming posts, get your 5 posts or replies in New Members and after that you could go shopping int eh ECF classifieds where you may find some good deals in juices someone else is getting rid of
Classifieds and swaps
There is also DIY which has a startup cost but can be the cheapest way to get more juice for less money.