So looks like it is proprietary, so no eBay versions!
http://superuser.com/questions/630637/does-the-samsung-np700z5a-feature-a-mini-displayport?rq=1
Might be easier to get an hdmi splitter than use the two ports.
I had issue where the card in one of my laptops would only push out over one port at a time.
@salmonchild started
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So looks like it is proprietary, so no eBay versions!
http://superuser.com/questions/630637/does-the-samsung-np700z5a-feature-a-mini-displayport?rq=1