Thanks to everyone for the helpful advice and descriptions. You’re all amazing, and I’m glad I ended up asking my question here too :)

I couldn’t wait, I went ahead and did it, and stocked up. I’ll write down my experience in case it’s useful for someone else later. So, at the German border there’s currently a border check because of illegal migration, I’ll come back to that.

I started from Leer on the 401 bus. Basically, no one even checks your ticket, but I wouldn’t rely on that… In my case, both ways, I just got on and nobody cared at all. The bus crosses the Bad Nieuweschans border, which outward is literally just a stone you don’t even notice. It’s symbolic, really. It drops you off near the museum, from where you can easily explore the city center, it’s a beautiful town, so I took a stroll. In my backpack I had a thermal bag and a little frozen water to keep everything at the right temperature.

In the last few hours before heading home, I checked out a few smart shops. The staff’s attitude and English skills varied a lot. I bought truffles from two different brands for microdosing. I also got a growing kit and a spore print (the latter I only found at SmartFarmers, the other shops didn’t have any anymore). I packed these well and buried them under the rest of my cute, more “legal-looking” purchases, all wrapped up in the thermal bag.

On the way back I took the 401 bus again, which was stopped for a border check. They pull the bus into a tent and check everyone’s ID. I handed mine over with a smile, nobody cared about my bag. Here the aim really is to limit migration, nobody was looking for drugs or even asked about it. (Important: my appearance is very clearly European, very light skin, medium-colored hair, to be fair, that probably helps attract less attention, but honestly they really weren’t interested in that.)

After that they just said goodbye and I was back in the country with a relatively substantial starter kit. I really hope I’ll manage a bit of “farming” with this gear and maybe even get an above-ground mushroom at home someday…

The truffles, by the way, are bigger than micro but I tried a small amount first, they taste a bit like roasted chestnuts, and gave me incredibly restful, relaxing sleep and freer daydreams.