Don't know, I couldn't get anyone to wait on me. Just kids behind the counter, and a shop full of their high school buddies ... 

Based on what I have seen and observed typical B&M charge .7 to $1. There are a few reasons of course. They do have the advantage of letting you sample and see what you like. They also often (not always) represent local juice makers.
I have yet to sell a single juice... I am still in Beta testing on about 8 flavors, because I won't sell anything unless I know people will like it and not just me. The initial investment on my part is well over $1000. I have used up close to 80 testing bottles already and have an order for another 100. When I sell locally I will include enough of a margin so I can recoup some of my losses. Were I to start selling online then the cost takes out the middle man and makes it cheaper.
I have bought a 50ml of juice for $5.64 so I understand cheap. Don't complain about local prices though... just act. If you think their juice is not worth what they are asking then don't buy it.
Here is a small portion of my investment so far...
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Here in Italy they are all crazy, I don´t even bother checking prices anymore.
Last thing I know from about half a year ago was 13 for 20ml, at 1 = $1.30 that´s $8.45 for 10ml.
They all argue with the need for quality but then most shops sell chinese 99 cent liquids for these outrageous prices.
They refill them in bottles with italian labels, claiming that makes them "Made in Italy" and that would be proof for good quality.
I´ve given up on them, I mix liquids myself from purest possible ingredients 100% "Made in Germany", I pay $0.20 for 10ml that way, no shop will ever come remotely close to that, no need to check their prices.
$6 for 10ml $16 for 30. You can also request 100% VG and they mix it right there for the same price. They also have come up with some of their own flavors. When Boba's bounty was not available they made some that was ungodly close. Still sold it for the same price. Everything there is about the same price as online. I guess I'm one of the lucky ones.