Pogo has re-released 60 previously-retired Mix-n-Match badges which are on sale for 16 gems each.
To find these badges easier, sort by "Retires" and look for the badges marked "Re-released" retiring on November 30th.
These badges were originally released in January 2008 and October 2015.
http://www.pogo.com/challenge/find-badge.do?searchtype=mnm&sortName=expires&sortDirection=true
(https://i64.tinypic.com/15hlumo.jpg)
Thank you. I will need to check them out later today.