Maine Coon Rescue Organizations
Typically breeders will re-home their breeding stock when they retire and spay or neuter them. They are frequently offered for a nominal fee or even free to a great home.
Sometimes kittens are returned to breeders due to allergies or other circumstantial problems. Reputable breeders have a clause in their adoption contracts guaranteeing that the kitten/cat will be offered back to them if it must be re-homed.
Finally, life is unpredictable and in the struggling economy of late, many cats end up homeless because their owners simply can't afford them anymore. Sad but true.
The organizations below may be able to assist you with finding a Maine Coon that needs a great home for much less than you would pay for a kitten from a breeder.