Check out the patch notes for the v20 Lovely Update here:

Character Cards

MapleStory 2 Rep: 820
Posts: 15
edited 9:59PM October 18, 2018 in Suggestions and Feedback
Maybe a bundle for 3 Character Cards at 2000 merits.

They're originally 790 per character slot, and you can have 3 extra slots. A bundle for all 3 at 2000 instead of buying 3 single ones at 2370? Just a suggestion :9.