I am not 100% certain but I believe shipping to/from Zimbabwe is expensive. The people I know who travel there once complained to me about how they sent some brochures there (or received from there) and they had to pay 30-40$ in shipping or so.

There's not a lot of freight between there and here, like with S-E Asia, so they pretty much have to make the way down specifically for that one package (almost, anyway) which makes it expensive

if you want to make a point about money and devaluation you should look if you can see if you can find some old german marks or polish zlotys. Otherwise it's easy to disregard inflation as something that happens far away, in crappy countries. And I'm sure there's some german bills floating around in the netherlands