Should I buy a Chihuahua online?

I live in upstate New York and I want to get a Chihuahua but I don’t want to buy from a pet store and I haven’t found any in shelters or on puppyfind.com, and I can’t find any breeders in my area. I have found many websites that will ship a puppy but I am concerned that it may not be a good idea because I won’t really know what I am getting. Has anyone ever bought a Chihuahua online, and from where? Should I buy a puppy online?