Where do you live? I've heard of Passover Coke for years but never actually seen it. Judging by the name, it must be a regional thing in places like New York that have a higher Jewish population.
I live in Southern California. I thought it would be hard to find when I first went looking, but the first Albertsons I went in had a giant stack of it. Do you have any grocery stores with a kosher section or an "international" section? That might be a place to look.
I've read it's available some places now; I haven't seen it myself yet this year.
I've read it's available some places now; I haven't seen it myself yet this year.