You mean just managing the incorporation paperwork? Around $200-$400 is typical. Look for a small business lawyer who will not only help you file all the appropriate forms, but also creates a business template binder for you with by-laws, meeting minutes, etc. There are a small number of things that you must technically do to be a real corporation (hold an annual meeting (even if it's just you and another person over a cup of coffee discussing "business"), file meeting minutes, re-new licenses, etc.). If you don't do these things, then you technically are no longer a corporation, which can open you to personal liability. 99% of the time, it's not an issue, but if you haven't run a small corporation before it's helpful to get the 30 minutes of formal instruction from a lawyer that will save you from having to figure everything out on your own.