Ask this question as your first message and you might not get the response you expected. Developing custom posts is long, difficult work, and most people that have built thier own or paid for them are probably not going to be willing to give it away for free.
Mastercam comes with posts for most machines that are good starting points right out of the box. Often times customizations are required or desired. Your first course of action should be to search the CD for a post for your machine. From there, you might ask for help to change specific items in your post. Most post developers are very willing to share code snipits or give advice on editing posts to attain desired results.
If you can't find the post you want, try your dealer next. They should be able to help you locate one.
San Diego, Ca
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)