These boards are not for buying and selling. Even if they were, the chances of someone seeing this who has the item to sell are slim to none.
So, here's what you do:
Go to Search. Set up a search for what you want. Click “Save this search”. You’ll be notified when one is listed for sale. (You have to be signed in to see the notification.) You don't have to renew the search if you don't buy that one. After you do find one, you “End this search”.
I hope you find your figurine.
