I recently had this done through the Ingrediants Corporation. It is a detailed process and they made it happen, so call a few co-packers first and go with whomever you feel most comfortable.
Peace and Smoke,
Powered by the West Coast Offense: Big Poppa Smokers and Simply Marvelous BBQ - "Walk with Us"
My weapons: Humphrey's Smokers and Grizzly Coolers