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Re:Ask HN: How to market Shopify app and find merchant conta... by sigmaprimus on Sunday November 01, 2020 @04:23PM (#24962624)
You could try nerdydata.com with "shopify" as keyword, that seems to find quite a few. Possibly using other more specific keywords might make a more targeted search.

Disclaimer: I never signed up for a free account so I only saw first 10 results but the result page indicated 151,101 sites.

Re:Ask HN: How to market Shopify app and find merchant conta... by sigmaprimus on Monday November 02, 2020 @01:24AM (#24965263)
What You are asking for could be scraped possibly, but really other than Shopify's internal records I doubt such a source currently exists.

The info You are asking for is quite valuable to Shopify as I suspect it would also be to their competitors.