A few which seems to be online right now:
[0] <a href="http:&#x2F;&#x2F;www.bigdataexchange.com&#x2F;homepage&#x2F;buyersellers&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.bigdataexchange.com&#x2F;homepage&#x2F;buyersellers&#x2F;</a>
[1] <a href="http:&#x2F;&#x2F;exelate.com&#x2F;products&#x2F;data-marketplace&#x2F;" rel="nofollow">http:&#x2F;&#x2F;exelate.com&#x2F;products&#x2F;data-marketplace&#x2F;</a>
[2] <a href="http:&#x2F;&#x2F;www.qlik.com&#x2F;products&#x2F;data-market" rel="nofollow">http:&#x2F;&#x2F;www.qlik.com&#x2F;products&#x2F;data-market</a>