We do have a weakness: we buy way too much on Aliexpress. Our warehouse is full to the ceiling and we have a few things with us. These are microcontroller boards (not just Arduino, also ESP and ARM), lots of interfaces and sensors and of course LEDs.

So if you need parts or just want to take a look, come by. By the way: we don't want to use it to finance the congress, but rather sell everything at cost price! If you are penniless and convince us of your project idea, we might give something for free: provided the project becomes open source.