Post your question on the cornsnake forum. There are tens of thousands of cornsnakes bred in this country every year. You should have no problem finding one directly from the breeder. One of the most experienced breeders is Kathy Love at Cornutopia. She should have a large number of varieties available.
Or you could attend a herp expo in your area. There will undoubtedly be corns available there. Insist on a captive born baby or juvenile.