A complete website with 4-5 pages (such as this one) costs $300.00, half before I begin, half when it's complete.
If you'd like me to update your website, there are a couple of options. My other clients prefer to send me a list of updates when they find the need at $40.00 a set. (Unless there's an ungodly amount of updates, that is. Then the price will fluctuate.)
If you want to continuously update, you can pay $40.00 a month and give me as many updates as you need.
Updating costs are negotiable depending on your situation.