We previously had a list of different website packages here, but that turned out to not be very useful, because most clients' needs don't fit nicely into any single package, and virtually all clients need some amount of custom work that varies considerably from site to site.
Since every site is different, the best way to proceed is usually just to contact us and let us know what you need. We'll explain your options, give you a quote, and answer any questions that you may have.
If you do need an entire website, as a very rough estimate, a site can range from a couple hundred dollars to a few thousand dollars depending on how simple or complex the site needs to be.
You may also want to check out our web applications, which can provide a relatively quick and easy way to enhance an existing website, and which can serve as the basis of a new site.