I can only speak for myself. I did put a note at the top of my page that If you have something that I am wanting and I have something you would like to please contact me. I do not mark things as available for trade in general since I no longer do a lot of trading. There is only 1 plant on my want list now & I put a comment there to to contact me if you would be willing to do a trade.
This way lead to a very successful trade with a gentleman this spring and we are doing a second one in the next few weeks.