This isn't a new Show HN since you've posted this before[1] with the domain postacard.io. What's changed since then?
There's room to reduce these costs as more people use the service. As long as I'm breaking even on servers I'll be happy :).
I wonder if there is data/logic on what would be the optimal locations (countries/cities/towns) where it is cheapest and fastest to send a postcard to that country or neighboring countries.
https://news.ycombinator.com/item?id=13272490 https://news.ycombinator.com/item?id=13275228