3rd one us just too little info. Doesn't "feel" right to me. Are they registered with YTCA? AKC?
4th one = NO! Run! These almost assuredly come from a puppy mill.
5th = Not a direct website to breeder so broker. Stay away.
Hope this helps. Also, you can look in the breeders section here...see the breeders that help with questions? Any of those would be good to talk to...even if not close to you, they may be able to refer you to a reputable breeder in your area.