Technical side:

Secure a Domain Name (first time and annual fee)......$35.00
Web Hosting  -  monthly fee w/e-mail........................$35.00
E-commerce functions & transactions if needed...................depends

Creative side:

Do it yourself .............................................................................$0
(plus cost of software if any)

Hire the Pro.....ranges from a few hundred dollars, to the tens of thousands.

The average cost of a business website done by an ad agency is $16,000

A top quality web site can be produced for about $200 - $300 per page based on your information. Sometimes lower, sometimes higher.