Best Place to Buy 312 (Hearing Aid) Batteries

I've joined crew hearing aids.
They take a 312 button battery. The audiologist made a point of saying to buy batteries from them, but the cheapie in me always wants to check that.
It's a standard battery that's available all over the place.

Yes, I can buy bulk from the usual suspects like aliexpress, but I'd be dubious about quality there.

So anyway, if anyone else is on this train, where do you get your hearing aid batteries?

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