There a lot of hole saws on Amazon:
Search there for the size you need...you'll find this:
You can cut from the back side with the pilot bit just protruding from the base of the teeth to get it started, then saw all the way through. A friend is making 50 to 100 at a time in this manner.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
Last edited by woodnthings; 08-29-2013 at 01:35 PM.