I have several full-size Audubon prints from the last "elephant" folio. Now you can get his pictures online. At Am. Digest, The Plates of Birds of America, Audubon’s Masterpiece Are Now Yours.
Audubon had a great time in the USA. A hero of mine. He was a fine diarist too. He also became a heck of a shot. What many do not know is that one reason his bird images are often in awkward positions is that he generally painted them from specimens he had shot.
As an aside, Roger Tory Peterson's prints are excellent too. Audubon was, of course, an inspiration to him. No dead birds.