Some prescient folks sent in extra and the additional postage is mostly covered by our swap partners. I should not be out of pocket more than a couple of dollars and I don't mind that at all. I get a kick out of handling seeds and if one of you had been hosting I would have had to spend 6.00 on the return anyway.
The padded flat rate envelope I like now ships for 6.80 so if we do this next year that will be the price of admission for priority mail. A first class return will likely be more than it was this time, also. I've not checked yet.