Last year I had to try and locate a Tortoise for someone.... after a few days of dodgy calls and random emails I managed to find a Pet Store out South that was "connected" to a breeder, only to be told that I had no business looking for one and that the breeder would not want to talk to me as they apparently only delt with that certain pet store. I must have stirred up a real hornets nest as she slammed the phone down, not the customer service one would expect.
After that ordeal and chatting to other soruces, it does appear there is a secret organisation of "underground" Tortoise breeders....don't blame them I suppose knowing how much they are worth and such.