I've also looked up the latest updates and added my thoughts! Here’s the price map of Seodaemun-gu - part of Mapo (as of 23.2.6). I drew this price map while traveling... I got up early in the morning at the Gangneung condo and barely managed to finish connecting the maps. Haha. On the right is the actual route I traveled! (It's the Rambler route shared by my colleague who accompanied me). I visited parts of Seodaemun-gu and Mapo-gu.
As you can see, the costs involved are not trivial, but I wanted to give a good café opening gift to be helpful. I got the idea from friends who run cafes, who recommended wooden banners or wooden sandwich boards as gifts. I'm preparing a café opening gift, but personally, I've never made a wooden sandwich board before. So, to be honest, I was a bit daunted.