What is an item below 100 bucks that everyone should own?

A water heater for the kitchen.

A kettle? The only kitchen appliance that's used multiple times a day... but I'm British so need my tea.

Also https://youtu.be/_yMMTVVJI4c

A Dutch bicycle is very much not under 100 bucks here unfortunately

A dutch bicycle. Made from steel, with a kickstand, a chainguard a dynamo and internal gear. Built to last.

If you want to spend slightly more, go for one with a hub dynamo. Those have way less resistance, and don't have a tendency to stop working in snowy weather.

Dutch bike less than $100? Where?

I just bought a casio duro batman (without the marlin unfortunately). It is my first ever watch. It looks absolutely stunning and costs around $50~$60

Get some silicone sport bands for it (18mm)

The stock band for the f91w hurts my delicate skin after a couple days.

https://www.ebay.com/itm/114784192109

Best watch of all time once you add the band. I've had it for several years and the battery is still going, and it keeps time more accurately than any other watch I've owned.

Just bought an imported, used, Japan made bicycle. Same spec as you listed but with roller brake dynamo. The thing costs more like $125. And please pay attention that's used. No complaint about the prize at all.