Looking For ECommerces With A Specific Provider

If you were building a SaaS for ecommerce stores but you were only able to integrate with one ecommerce provider (WooCommerce) at the moment.

How would you go about finding ecommerces using that provider so you can reach out to them later?

Right now I’m:

Googling: “buy [CATEGORY] online in [REGION/COUNTRY]”. Entering the first 10-15 stores. Using Free StoreLeads extension to see which provider they use. Create my own database on Sheets one by one.

Any ideas? Can’t afford StoreLeads platform rn.