Came in to say this. Haven't found any of it in my area for years.
You can usually find Violet Crumble at Cost Plus World Market. They also have a lot of other foreign and hard-to-find candy, like Lion, Bounty, Aero, Mars bars, Ritter Sport, Milka, Hi-Chew, Kasugai gummy candy, Japanese Kit Kat, jelly babies, White Rabbit creamy candy, Chimes ginger chews, Lakerol, Niederegger marzipan bars (another favorite of mine), and C.Howards violet mints.
---Minutus cantorum, minutus balorum,
Minutus carborata descendum pantorum.