If you are looking for many older ones, and can't find a trade person, both Wild Iris Rows and Blue J Iris carry a large variety of older irises for $4.50 or less. Lots of historics at Blue J too. C & T Iris patch has lots of older SDB's too if you have some you need to catch up on.
I have many older varieties in my list. Just let me know if there are any that you would be interested in.
