I bought my first corn at PetSmart, here in Canada. They were feeding their corns hoppers since they didn't carry pinkies (Hmm...)... the hoppers are way too big for them. Easily 3-4x their width, I have no idea how the snakes were eating them!
They also housed several of them together, and it turns out they were feeding the 2-year old BPs the same as the month-old corns...
Payed $150, which is pretty hefty. As well, both of the reptile workers were scared to handle any of the snakes, so I am having to hand-train it myself (the staff literally plucked the snake by his tail, and tossed him into the travel-cup-thing). They also did not know the genders of any of their animals.
Though the staff were friendly, and they were honest.