You can get "premium"
juice from the following sites at wholesale cost. It's very useful if you find yourself enjoying those $24.99/60ML juices but hate the cost. Since the cost drops to about $11/60ML with those same juices, it makes it a bit easier to justify your spendings. Make sure you check Google for coupon codes for them as well, they occasionally have a 10-15% code running that makes it even cheaper.
eJuice Direct | Premium eJuice Buyers Club
Wholesale E Liquids - Wholesale E Juice - E Cig & Vapor Products | Ejuice Connect
Beyond that, I personally use B-X Vapor and Freeman Vapes fairly often.
B-X Vapor currently has a 33% off coupon "MAY33" and sometimes go as high as 48% off. They also include extra
juice in your order at random quantities. I've never gotten under 30ML of each flavor added to my order when I pick up 120ML bottles. On top of all of that, they offer
juice in a bargain bin which is just oversupply that has aged past their standard of fresh. Cuts the price in half and tastes the exact same since it's only 1-3 month old juice.
Freeman Vapes is currently running a 2x 120ML for $24.99 deal which is pretty nice. Everything I've tried from them has been great in both sub-ohm tanks, and RDAs.
B-X Vapor
Freeman Vape Juice USA Made 120ml E-Juice Premium Cheap
I generally buy juice priced in the middle of the competition. People selling juice at almost $0.50 per ml is criminal, and people selling 120ml's for 5 bucks generally leads to low quality peppery nicotine. Middle of the pack seems to rarely go wrong.