Well, Black Jungle is pretty good, as is Glades. Both companies have reputations to protect. Black Jungle is really good, but their main busniss is darts and terrarium suplies. Occasionally they have other amphibians for sale. I have never done business with Glades but a friend of mine is really good buddies with the owner and he has nothing but good things to say about them. Reptiles Mag did an article on them not too long ago.
I have done very little business through kingsnake. I did by some cave salamanders from Nathan Horton. I was a bit nervous doing this, but in the end it all worked out.