Pogo has re-released 52 previously-retired Mix-n-Match badges and are on sale for 12 gems each until January 7th, 2022.
To find these badges easier, sort by "On Sale" and look for the badges marked "Re-released".
https://www.pogo.com/challenges?filters=MNM%2CON_SALE%2CUNOWNED&sort=RELEASE_DATE_REVERSED
Say it isn't so! Are we back to 25% off?
Aren't these normally 12 gems each?
I see that the last 5 BFTV sales were for 12 gems each. I'm not sure if it was any different going further back.
They've always been 25% and only 50% on special occasions.
There are a few of them that are worth 400 Pogis that might be worth picking up.