Advent calendars for teenage boys?

[TheSpikySpinosaurus]

No chocolate.

I've done Pringles and jam ones in the past and they have been well received. Any suggestions?

I've often pondered the one where you build a clockwork radio. Saw it on Amazon a few years ago but can't remember the brand name.

Jelly Belly, Joe and Seph’s or Snaffling Pig pork scratchings

I've got Naked Marshmallow ones for my teen sons. Cheapest I found was on PrezzyBox and go through TopCashBack too.