Check out http://openbazaar.org - if you have Windows 7 you can already test their client out (unfortunately it doesn't works on Windows 10) - this is the bomb for Dark Net Markets activity!
They have really huge community at /r/OpenBazaar and basically OpenBazaar is a browser which means that you can use links like ob://@YourStore to access your store, to have permanent place to sell, or to have your favorite stores bookmarked!
Also OpenBazaar has built-in MultiSig based Bitcoin customer fraud protection - which means that you can have your deals settled without risk of being ripped off. It works like a regular Escrow, but in a decentralized way! If you choose a moderator as your contract protection (which works in a user friendly smooth way!) - then this independent moderator could help solve disputes!
Everybody can become a moderator on OpenBazaar and earn some little fee from all goods no matter if dispute occured.
Platform works fully in Bitcoins!
The interface is very very sexy! Check it out! http://www.youtube.com/watch?v=FuIUaxDvadU
Don't forget main rule: You better try it 1 times, than talk about it 1000 times! (but don't forget its still beta!)
Syscoin.org for a better decentralized market. Also in beta on test net. Many advantages over OB.