DC, Now I'm thinking harder about this, and do have some concern about the way this is headed. if you're giving away a plant, negotiate via PM or email whether you want the recipient to pay shipping or not.
I would hate to see a thread where folks started "bidding" on what they have to trade in a thread. Consider the scenario where you have something to trade. I want it. But so does Dolly. And so does Ray. (Sorry Dolly and Ray for using ya as examples, but figure you'll each take one for the team.)
So I offer to trade something, Ray offers a better trade, and Dolly ups that trade. Then along comes Bill Nye, and he offers a trade of something he KNOWS you must have. So now you have four forum members all vying for something. Someone's gonna end up getting their feelings hurt, because it's all being conducted on an open thread where everyone views what others are offering. What we end up with then is a mess.
Aside from that aspect, there's the consideration that some are more trusting than others. So you start sharing your shipping address, name, etc, to someone who wants to make a trade with you. With some folks that's okay, with other folks you submit yourself to possible shady behavior. Unfortunately, that's the way life is in our new cyber world regardless. And then someone gets burned, or believes they've been burned, and start bitching at OB moderators to do something about it.
I know the Classified section is already here. I have no idea of costs, and I've never tried to place an ad. So perhaps the best idea is to use Classified section, do a "want to trade" type ad, and leave it out of the general forum threads. I'll research more and get back with ya. I'm a moderator, new to it, even though I've been around for awhile.
Please do an "all stop" until I have time to research this a bit, and chat with fellow moderators.