I do
but I think it'll be a couple years before I'll be selling any unfortunately. I don't think I've seen butters at the MD show, but that doesn't mean there won't be any this year...like I said I got some really nice ambers there in '00. Also a word of warning...I've seen at least 1 dealer and maybe others who've had lots of corns which were labeled either blatantly falsely, or at very least exaggerated, and that breeder showed no sign of understanding the genetics very well. So check whatever you are looking at and make sure you know what you are getting.
Another place to check is called 2001: a fish odyssey. It is a retail store in Timonium, right near the state fair grounds. I bought several snakes there, they usually have an ok selection and prices which aren't bad for a pet store. They also really know what they are doing which is hard to find in a pet store. I would call ahead to see what they have.
Alternately, you can try to wait till September...MARS, the Mid-Atlantic Reptile Show is held at the state fair grounds and there will definitely be tons of corns there, and the biggest selection you could ask for. You just have to wait till September, which isn't easy...