A large bicycle tube is around €3 at Decathlon. Also at Decathlon, tubes for small scooter tires are upwards of €12. Those are close to the size of hand-truck wheels. Not sure why the price is so high. It’s much less material and with scooters clusterfucking the cities in such high numbers, surely the tubes would be manufactured in a completitive market.

The small wheel tubes start at €17.50 at Brico.

The best price I found was a small trottinet shop that charges €10. It was surprising to see the little guy undercut Decathlon. That’s still about double what I would expect. Can anyone suggest a shop that might be cheaper?