Oops, my bad.. Obviously non-alkaline batteries.. Carbon-Zinc aren't as common as they were, but most dollar stores still carry them.. The ones I used recently weren't brand labelled very clearly.. They're metallic blue, and read HEAVY DUTY in big letters.. I see them alot actually.. HW brand can yield carbon too, or atleast they did last year.. Sorry I don't take note of serial numbers obviously.. Just google ["carbon-zinc" battery].. You'll get links that sell them, and links that yield info on brands that may not make it obvious on the packages in stores.. Really isn't that tough to find a source.. Cheapo brands are your best bet, but you're right they have been moving away from them for a while..
And most of us work with the same caustic chemicals when we solder anyways.. General rule of thumb, if you find zinc instead of carbon, that type isn't what you want..