I'm a web designer. To be honest, that is a very vague question. In order to give a quote to a customer, I need a lot more information. Do they already have an existing logo? What sort of business am I making the site for? Are most of the pages similar in format? Is the text finalized or will I be expected to get it web-ready? Do you want me to do SEO (search engine optimization)? Will the site need any scripting? etc. etc. etc. We recently made a web site for an opera company and the price we agreed on was $1,000 (existing logo, no scripting, site is about 15 pages, SEO--we got him to #2 on google for the term of his choice in less than a month--that alone is worth well over $1,000), which was much lower than another quote he got.
For the most basic 10 page site, I would think a minimum of $500.