Ebay listing
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xuniversal+mounting+hub.TRS0&_nkw=universal+mounting+hub&_sacat=0
Attention in classroom
Ebay listing
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xuniversal+mounting+hub.TRS0&_nkw=universal+mounting+hub&_sacat=0