Where to buy app

I have a food brand. I am in several retail stores and I am looking for a good "where to buy" app. It seems that most of the apps on the Shopify app store are "store locators" like if you have your own brick and mortar, but I'm looking for something that allows me to add different stores.

Ideally they would have a free plan to get started.

Also open to integrating some other tool but not really sure where to start as my custom integration skills are basically non-existing.

Any suggestions?