Naice advent calendar suggestions for 15 year old ds please?

[iknowimcoming]

I've got dd a lovely bomb cosmetics bath bomb one, dh a pork crackling one but despite googling and racking my brains can't find anything suitable for ds- any suggestions welcome, up to about £20 ideally? He is mostly into computers .......

My DS is 13 but I can't find anything for him, a real gap in the market!!

Mine asked for Lego and I've got him the Star Wars one.

Some things you just don't grow out of. I think his DF is envious