There also was a venue known as EurekaTrading. One good guess as to who the proponent was there I prefer using C.C.E. simply because the hosts (Coin Universe) are leaps and bounds above the others with regard to features provided and ease of navigation, not to mention the deep pool of resources from participants.
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"Everything is on its way to somewhere. Everything." - George Malley, Phenomenon
http://www.american-legacy-coins.com
There's also CoinNet. I have used them all, and I prefer CCE.