In germany, a common method is using dead-mans package stations from DHL using stolen one-time credentials to pick up the package.
However, buying or selling weapons is no joke here.
You can buy an amount of weed here (for personal) use that would absolutely get you convicted with "intent to supply" in the UK.
My weed smoking friends were worried they wouldn't be able to pick up when they came to visit. It was not a problem.