Pogo has re-released (15) previously-retired Mix-n-Match badges in Pogo Bowl today. These badges cost 16 gems each and are available until November 30th.
These badges were originally released in November 2006 and April 2016.
http://www.pogo.com/challenge/find-badge.do?searchtype=mnm&sortName=expires&sortDirection=true
(https://i67.tinypic.com/iq8z28.gif)