It really varies depending on the brand. See related links below to compare the prices. The cheapest one there is $19.95.
16 cups = 1 gallon
On 9-24-2012 in central Illinois it was $3.75
Cheaper shampoo has more water than the expensive shampoo, making your hair greasier much quicker. If you turn the shampoo bottle around and read the ingredients and the first one is Water, then you know it won't do much for your hair, so look for one that has the first two ingredients without water.
very very good shampoo i like this shampoo so much
8.3 pounds or 3.7 kilograms.
One liter of water is about 0.264 US gallons.
shampoo going in your eye and much more...
It depends on the make of the shampoo it shouldn't be to much unless you go for the top quality professional stuff
You can find reliable reviews of shampoo brands on pretty much any site. Most brands of shampoo will have a website you can visit that will usually have customer reviews, you can also go on amazon and read the reviews there.
At the Shampoo Bowl store one can buy such products as Shampoo Bowls, Shampoo Bowls + chairs and all the associated accessories, and so on and so forth.
Dopends where you go
Different prices.