Where do you all rec to trade geocoins online?

I noticed that both trackable and non trackables are listed in trade lists on Geocaching.com, but you can only sell trackables there?

Is there a good site to find want/trade lists?

I have looked at Cointracking.com, but can not find a way to list many of the older coins that I want to trade, because they are no longer taking list additions. Am I missing something. I see the coins listed by other traders, but the little 'plus' sign you push to add to your own list is not available.

Does anyone ever get together to share coins collections with the option of trading?

Thank you!