Ask HN: Good present for young tech teen?

My girlfriend and I have started our Christmas shopping this year. My girlfriend has a cousin that I usually hang out with during family gatherings, he’s a cool kid that is now 13 years old and is into gaming, YouTube and technology. I want to buy him something that he can tinker around with. I know that he owns a few Raspberry Pis and takes programming classes and was wondering if HN has any good ideas for a present for such a kid?