@hi yeah I still want a small bank for testing at some point.

I think, like for all cells, your best bet is Ali Express. Some vendors have European stock (usually in Poland, Germany or Spain) to ease and expedite shipping. Some established sellers also have their dedicated shop(ify). I ordered my cells from https://hakadibattery.com who seem to have a good track record across the various stores they sell in, but can't vouch for them until I have received the cells myself.