How do I get brew catalysts other than the Diamond Shop?

Thanks!

Festival shop sells Mystery Brew Catalysts for 400 choc. coins each

Trade Broker (more later in the fest)

Random drop from any enemy or chest/pumpkin in the fest zone

Haunted House

Item Trade Forums (more later in the fest)

Forum Games (possible prizes once finished)

Leaderboard Reward Pouches? (can't remember but I think so? at least as a possible drop)

ToT? (I don't know if you can get them from handfuls of candy? maybe)

Task List Rewards:

Complete 7 of the Daily Tasks (once a day, obviously) (Mystery cata)

Earn 4 Leaderboard Reward Pouch from Contests (Fabled cata)

Nurture 10,000 Sylesti (Regular cata)

Defeat 10,000 Enemies in Umbra's Veil (Regular cata)

Defeat 200 Named (Bosses) in Umbra's Veil (Fabled cata)

Trick or Treat as Host 4000 times (Fabled cata)

Trick or Treat as Visitor 5000 times (Regular cata)

Create 200 Handfuls of Candy from Trick or Treat (Fabled cata)

Complete one brew of each of the 14 Regular species (Fabled cata)

Complete one brew of each of the 8 Fabled species (Majestic cata)

Purchase Entry for the Haunted House once (Fabled cata)

Purchase Entry for the Haunted House ten times (Majestic cata)

Thank you!!!