[runjake]

This service has already existed for centuries.

You would use an engraving service. Almost every town has one[1]. There are also online options[2].

1. https://www.google.com/search?q=brick+engraver+name_of_town&...

2. https://www.etsy.com/market/brick_engraver

[HoldOnAMinute]

Honestly, I think you missed the point. It's not about an Etsy brick. It's about it being in a place it could be seen.

I am surprised I had to call this out explicitly, given that I even listed the ones at Disneyland as an example.