This is indeed my question as well. I am Czech. We are right next to Germany. Theoretically, this is one huge Common Market. In practice, many mass-produced things are much more expensive in Czechia than in Germany, including food.
I suspect that the language barrier is still real. But then again, German-speaking Austria experiences the same thing.
I wish we had a common European delivery service, like the US has US Post or DHL, with the same cost structure across the entire continent. We don't, a package from Spain to Czechia is much more expensive than within either Spain or Czechia.
A common European delivery service would give foreign e-shops a massive competitive edge. Suddenly, it would be more efficient to buy cheaper things in Slovenia or Bulgaria.
