Mrs. Fields 115 Half-N-Half Cupcake Pan for $11.99.  Shipping is $5.00 for a total of $16.99 shipped.  Here is a screenshot for your reference.  This cupcake pan featuers an easy-to-use-and-clean divider to separate cupcakes into two halves.  It is made from non-stick carbon steel and plastic, and is oven safe up to 425°.