I also want to share something that according to me a good web designer plays an important role in the success of ay business. Cost of hiring a web designer depends on which type of work you required. A fully functioning E-commerce site with maintenance web page design costs can run into the hundreds of thousands of dollars for a large company with many different product offerings. And this type of website you don't make untill you are proffessional in this field. Any way Thanks for sharing..
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There is no such standard that describes the amount to be paid to a web designer. However you can choose a decent professional within your budget from the online services.
It really depends on your needs, but I think you can start from not less than 100$. The cost is not the only thing that you should consider when hiring a web designer/developer.
Check out this article to get tips on what to do and what to ask when you want to hire a web designer.