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Here's a few links that I've tried myself:

Also, these guys in Poland have been recommended to me by someone whose cheesemaking skills I trust, but I haven't tried them myself:

I order my vegan cheese cultures from https://www.kaese-selber.de/ in Germany, good results so far

i've been doing it in the netherlands, i found that the online craft beer suppliers also often supply cheese making ingredients. eg brauwmarkt

I'd be interested too.