Hmmmm, I was assuming that demand for this is likely to be low (limited to people who don't have broadband) therefore each person wanting a DVD set could find a willing volounteer to burn and mail the media.
That would be informal enough, and the volounteers could even negotiate a price to cover costs and discourage 'unworthy' requests (though the hassle of transferring a few bucks across countries and currencies is unlikely to be worth it).
I don't have a DVD burner at the moment, though if I did I'd be happy to send out a couple of packs for free. (Just to keep my Karma topped up, if nothing else)
What do you guys think? I have seen this sort of thing work quite well in some communities.