He he, surprisingly, I got it for $31.00, plus shipping.
As I pointed out somewhere else, the trick was to search eBay for the expression "flow meter" and to exclude the word "flowmeter" (no space); it pulls up items that are seen by fewer people, because the search is more complex.
The explosion-proof housing isn't necessary, but I'm not complaining, for that price.
(Claimed accuracy of 1%).
It took me a few months of searching through eBay, but patience prevailed.
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