Not hard to find at all. I just bought a half dozen from this source on Amazon:
http://www.amazon.com/gp/product/B00...HWKJGU4ZTW3TJP
When we moved earlier this year, I tossed most of my assorted old bottles, and since they seem to stay in the darkroom for years, I figured I might as well replace them with the right tool for the job in the new darkroom.
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