(https://i.imgur.com/9KfVNrQ.png)
Pogo has re-released 215 previously-retired Mix-n-Match badges and are on sale for 6 - 10 gems each.
To find these badges easier, sort by "On Sale".
This sale is valid through April 14th.
https://www.pogo.com/challenges?filters=MNM%2CON_SALE%2CUNOWNED&sort=RELEASE_DATE_REVERSED
Nice price! TY
Indeed! I'm stocking up before this sale ends.