Once you've been here long enough, and have an adequate posting history, you can buy, sell and trade mouthpieces with members here. Heck, my favorite mouthpiece of all time was secured here in a trade with another member many, many years ago. Just whatever you do, when trading or buying without a return policy, insist on only unaltered mouthpieces. That way if what you pick up doesn't work for you, you'll have an easier time passing it on for the same value paid.