As part of the 25 Days of Pogo Celebration, Pogo has re-released 30 previously-retired Sea of Color badges.
You can pick them up in Challenge Central for 16 gems each.
To find these badges easier, sort by "Mix n Match" and release date "New to Old"
These Sea of Color badges will be available through December 28th.
https://www.pogo.com/challenges?filters=MNM%2CUNOWNED&sort=RELEASE_DATE_REVERSED
Full price, no thanks.
True, but it gives people the option to buy them separately if they didn't want them all.