I recently purchased some hives from Jack Tapp over in Chapel Hill, NC he had alot of package boxes onsite. Not sure if he sells them but I am sure if he doesn't he could turn you onto someone that does. He was great to deal with!
Here is his contact info:
Jack Tapp - Busy Bee Apiaries
1201 New Hope Church Road
Chapel Hill, NC 27516
Ph. 919.942.2006 [email protected]