Hi Cbelt --
to ATP and to our Iris forums. We're glad you're here!!
Missy answered your questions -- all I would add is that you are acting as your own free agent. Most of us ship our Irises in flat-rate boxes, in which case you tell interested persons how many rhizomes you can fit in a small or medium or large box -- and what it would cost to ship each of those. They decide how many rhizomes they're interested in, and therefore what it will cost to ship, and then they either send you a check for the shipping expense (in advance of shipping) or if you have a Paypal account, they can send it that way.
Or -- if you agree on a trade, then you each pay your own shipping costs and do not exchange money. Unless one ships a small box and the other ships a medium or large box -- in which case someone sends someone else some money. See?
It's all very informal. Just jump right in and tell us what you've got to share!!
BTW -- do you want us to call you Cbelt? Or can you share your name with us.............
