I managed to source some zumba kits from China which looked 100% genuine but you can never truly tell.. regardless the profit margins were great but then Zumba threatened me with a law case saying I couldn't provide a receipt of purchase to authenticate the products being genuine or not.
So rule of thumb, Most products on TV will get you into trouble on eBay as the VERO team will remove and suspend you from eBay.
They don't deal with small consumers they have huge licences and trademark laws to prosecute anyone that goes under the table. I also believe that they will take you to court if you continue to sell their products without approval.