OK -- needed to get that message out there fast!
Omigosh Marilyn -- you're offering a few really nice Irises. I'm excited to be getting them.
To answer your questions: First of all, the person who is providing the Irises should be paid the postage expenses in advance. This can be done by check, money order, or Paypal. This would be agreed upon between the parties involved. Generally it works out best for the Irises to be shipped in a flat-rate box via the post office -- so the shipping expenses are standard -- $5.85 for the small flat-rate, $12.35 for medium I think, and $17.35 for large. When shipping just a few rhizomes, usually they will fit in a small flat-rate. If the parties involved are swapping rhizomes, then no money changes hands -- each party just ships the agreed-upon flat-rate box -- unless one party ships a small box and the other party ships a medium or large. In that case, the person receiving the more expensive box would reimburse for the different in shipping expense. Still with me?
So. If you were to ship me three rhizomes -- English Charm, Crooked Little Smile and Chocolate Ecstasy -- they would likely fit in a small flat-rate box, and I would owe you $5.85 in advance of shipment. If we decide to swap, however, I would ship you three rhizomes in exchange for you shipping me three rhizomes.
Re: Red Masterpiece. I'm sorry -- I don't have any of that one. I have quite a few reds, but not that one.
However -- I do have lots of Irises and can easily share some of them. I'm going to go look at your list and see what you've got and then come up with varieties for you to choose from.
And Leslie and I are probably in the same position -- now is a great time to be planting Iris!!!