Rockpile, you may already know this, but just in case - to bring up a list of all sources for one plant -
-- Go to home page of swap, and click on "Access the full trade list for this swap."
-- Then, in the Search Box, type in the name of the plant you're interested in. You should then be able to see all the sources in the swap offering that plant and be able to compare which are still available, whether self-harvested, traded or bought, date of purchase or harvest, etc. I keep a tab open just for this purpose during a swap.
Sometimes, this doesn't work for me, so I go back to the swap home page and do it over again, which clears any previous searches I may have forgotten to clear.
Hope this was useful,
karen