I was just thinking along these same lines. 92Caddy ~~ how about selling your eggcartons here on the BYC ? I know I'd be interested in a reasonable price !
We are going to the same : try free range chicken eggs, and while reusing cartons is allowable in PA, I thought using our own cartons would make it easier to market to some other types of venues. A new carton at .20-.30 adds a lot to a $2.00 or $3.00 dozen of eggs. I'd also thought about 'discount for returning cartons' but many of our customers do it now for free (and often get us additional used cartons from others).
FYI, Media Mail is used for books, film, manuscripts, printed music, printed test materials, sound recordings, play scripts, printed educational charts, loose-leaf pages and binders consisting of medical information, videotapes, and computer-recorded media like CDs and diskettes. Media Mail cannot contain advertising) ~ note that magazines do not qualify for media mail). Using media mail for anything else is a federal offense. Post office has become very careful about 'media mail' shipping because of so much misuse. And while the worst that would probably happen is that the shippee would get the package with POSTAGE DUE, it is not a good practice.