So far, I've found that "standard" pricing for B&M shops locally tend to be right around $1/ml - 10ml bottles being the most common by far, avg price being between $9-$12 per 10ml bottle. I've found that most of the B&M's that make thier own tend to taste very medicinal/artificial. I've been primarily vaping HHV because of price $21 for 50ml bottles or $0.42/ml seems a lot cheaper and flavor thus far cant be beat (IMO).
Some of the more expensive brands I've found tend to have a lot of image and are typically more expensive packaging. That being said, I'm not sure I like any of them enough to vape the expensive stuff regularly. Halo and Five Pawns come to mind here; generally $27-$30 for a 30ml bottle. Halo is good, and I have enjoyed most of the flavors they have - however, I switched to make things cheaper, and a 30ml bottle only lasts me about 2-3 weeks depending on device.
I'm super intrigued when I find a truly expensive liquid. Such as Mido's Scorpion Blood - which was 25GBP + 14GBP shipping for a 30ml bottle. It's very good and has very interesting packaging - at $54USD for 30ml though, it's definately something I'll treat myself with once or twice at best. So far the really expensive stuff hasnt let me down, so I'd have to say it's a "get what you pay for" but AVE and HHV I can hardly rank as "expensive" considering for about $45 including shipping, I can supply myself for well over a month (would have been approx $360 with analogs).