Yes, it does seem like I can only pull up a list of a members 'haves' but then some may be marked for trade, others not, and when sorting through hundreds of plants it is hard to do, I can see how that would be difficult for someone on a small device/phone.
the member has an option of creating a list only for items available for trade, but many people don't do that.
You can go to the top of their plant list and select only a certain type of plant to search for though and that should make it somewhat easier. For example you click on a members profile, then go down to where it says "so and so's plant lists" and click that. Then it will take you to a plant list page that has 3 options at the top-wants, haves or used to have. choose one and then under that you can get a drop down menu that allows you to choose genus. So once you choose 'have' list, then choose for example-iris, and it will list all the iris that person has. Some of them may be marked simply as have, others may be marked as for trade. But after that you are right, there is no way that I can see to sort out ONLY the for trade items.