My DH talking about this very same thing today! Charge an extra 50 cents, then give a 50 cent credit if they return the carton! (I deleted only part of my original post, made no sense, sorry!) Went to Rural King today, they sell egg cartons only at this time of the year. Forget about trying to buy egg cartons or oyster shell in August, you cannot find them on the shelves!
Theresa