In a move that may flood the market with more 'paper' gold, CME Group Inc., the parent company of COMEX, the leading U.S.

The 1-ounce platinum bars are available online now to members. This isn't the first time the store has sold precious metals. They've sold silver coins and gold bars that sold out like hotcakes.

CME Group's introduction of a 1-ounce gold futures contract aims to meet surging retail demand but raises questions about the dominance of paper gold and its impact on the physical bullion market.