Please take the time to finish your profile. Listing your state and hardiness zone will help with trading plant material.
Also members are kind of cautious when new members come on garden.org and start requesting trades right off the bat. You would likely see more interest in your request if you would post regularly on a few forms and get to know the community a little better. Stick around and if you are active on garden.org I'm sure next year others would be more than willing to trade with you.
Offering postage was kind of you, some new members don't even offer that. Sometimes in June - August you'll see members selling irises they usually run about $3-$5 each. to see what members are offering you can check the classifieds
https://garden.org/forums/view... I've got many great plants from the classifieds but this time of year not too many people are selling anything.
Good Luck finding what you are looking for and welcome to Garden.org