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Forgive the early edit. The reasons for the edit are better understood by reading the Charter:
For reasons that have been discussed many times in this forum there really isn't a "best place" for selling domains. Why? Because the best salesforce a domain can have is to be an inherently attractive and desirable domain.
Google site search for best place to sell domains [google.com]
Expressed differently, shoddy domains can put listed and pumped-for-sale all over the Web without success. Even the huge marketplaces - where you would assume many go to shop - don't move more than a small percentage (<1%) of their listed domains in any year. That means 99/100 domains really don't have a buyer. The number is likely more like 999/1000 domains don't have aftermarket buyers, someone willing to pay >reg fee.
That said, list them everywhere you can (without incurring a listing charge, other than a sales commission).
As stated above, we have discussed this topic many times. There's nothing new to gain. Therefore this thread is now closed and locked. Due to spamming this topic - places to sell domains - will not be covered again any time soon.
It's 2010. There's no mystery to this issue that the slighest of effort can't unveil. Junk don't sell. Good domains sell themselves. The major aftermarket players are well established -> good luck competing.
To the "new place to sell" promotional spammers - I'm sure you can compete as there's more than enough junk domains to be listed everywhere . . in hopes of finding a buyer. But for openers you need to work on the "trust issues" for your new service. You DON'T build trust in your website/service by spamming forums.
At least not the forums that frown upon promotional posts. ;0/