Well since nobody answered, i'll give it a shot
There are the big ones that are considered reputable, such as
RioBravoReptiles (
Welcome Rio Bravo Reptiles)
Barry Miller (
www.millerreptiles.com)
Futo (don't know the address)
Tudehope (don't know the address)
Then there are the small breeders who advetise in kindsnake.com for example. They may not be well known, but that doesn't mean that they are bad or the snakes they produce are not healthy and in bad condition. If you find what you're looking for in terms of snake looks, health, breeder's cooperation, etc, then i don't see why shouldn't you buy from them. Ask for pics of the snake, its siblings, and parents. And some other stuff that will make you comfortable.
Or you can buy from Danktat in about two to three months, lol
