In another comment, OP writes: > Bought an initial list of 2m stores for a few hundred dollars from a website called "Built With". Think they are used for buil

In another comment, OP writes: > Bought an initial list of 2m stores for a few hundred dollars from a website called "Built With". Think they are used for building sales outreach lists. Then narrowed down the focus to stores to US only and between $100k - $1m in revenue to keep the initial data set manageable (and the CPU / Storage costs reasonable).