I tried to give a deposit actually to one of Canada's best known breeders and he said it was not needed. I've also asked if I could then pay in advance for the total cost. Like Rev said it all depends on who the breeder is. I've bought from Don P. and would have no problem giving HIM a deposit. In my opinion it all depends who is asking for it. If Cory Woods wants some money down on one of his higher end animals then to make sure I don't miss out I'll give him money to or maybe pay for the whole thing up front. This hobby of ours is quickly become like ebay with all the feed back that goes around. People that burn people don't usually get too many other chances to do it twice.
My two cents,