Getting the snakes from Canada is your best bet unless you are wanting to wait a couple months to a year for paper work. Like chryseis said, costly and complicated. I also agree that most of those animals are most likely wild caught. If you are getting large snakes and you don't want them to be 'little buggers' then I would suggest not getting wild caught. Henry Piorun is a very good breeder. The majority of my animals I got from or through him and I have never had a problem with any of them. I would highly reccomend him. (Great guy as well) As for Port Credit myself I have never dealt with them but have no reason to think they wouldn't be just as good. Hope that helps
In the words of a Ball python, "I won't eat it, but I'll squeeze it."