Not sure if I am supposed to be linking to other sites (if im not just edit please mods)
But for looking up any info on breeders Rich Z runs a wonderful BOI. There is both American and Canadian BOI there and you can simply type in a name, and see what others have said.
It's located here:
But I also agree that getting to see what you are buying when buying from an unknown can also work out fantastic. Just do lots of research and you'll get a feel of who is shady and who isn't.