Here’s a good article. “How Much Should A Website Cost in 2016?”
An important point concerning modern web design tools like Wix:
However, it does pay to spend the money to have a professional company create or redesign your website. While free tools can be useful, you are more likely to get a better, more reliable website if you pay to hire a professional web design company. Websites built on free tools often lack a unique identity because free templates usually only allow a certain extent of customization. Websites using those tools may have no brand identity or may have trouble attracting traffic. When it comes to web page cost, cheaper isn’t always better. But what is a reasonable cost for what your website needs?