My wife and I are always looking for new Catholic products to bring home. It’s always a safe bet that, after Mass, I’m at the Catholic gift shop to see if there are any new arrivals. Often, I manage to add to my collection of sacramental and trinkets; but lately, I’ve found a lot of really cool stuff online.

For a while, I was relying on Etsy to find cool Catholic small businesses that I wanted to support—that’s how I found the first review item I wrote on. Recently, however, I was turned onto PetersSquare.com, which is an Etsy-type on...