Gift ideas for 13 year old boys please

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I need to buy a present for a 13 year old boy, but I don't know what they want! What's popular ? Budget is about 20 pounds. Thanks

Fortnite currency or whatever it is!

I've just bought a present for a 15 year old boy.
I got him some ear buds and a bendy phone holder thing off Amazon. It will hold a phone on a surface or it hangs around the neck and the phone is held up in front of you- good for a car or plane journey
I'm hoping I am original and right on

Last year I got him a north face beanie. That went down very well
Someone on here linked me to a supermario mushroom light that looked good but my nephew isn't into supermario

Thank you all :-)

A nice crisp £20 note! Thirteen is the age where boys like to have money for gifts so they can buy what they want.