Yes, the 6-volt type J batteries are still made, I see them once in a while when I'm at several local battery suppliers but you don't usually see them in "regular" stores often anymore. They're used in all sorts of things like TV remotes, cameras/flashes and medical devices...
They look like this:
http://www.amazon.com/Energizer-Type.../dp/B000UXAL1A
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