no idea. It's like a lot of other goods and services, advertising prices on the internet is still not widely practised, you have to phone around.
For my first job application, prior to the interview, they phoned me and asked how much I was expecting for the role, I said a figure and they went on to say I'd have to take on some extra repsonsiblity for that salary, so why bother asking me I thought, just tell me what you are paying for that role.
I was also asked in my second application during the interview, again I guessed based on what I was paid in the UK and used $2/1GBP, they offered me slightly less, but I wanted to secure my first job so accepted. It's very low pay for what I do and about 30% below the avergae for my experience. I get 2% pay rises if I'm lucky. Needless to say, someone leaves the company every month or so.