Many older and/or casual gamers who've stopped following gaming and are living under the idiomatic rock would absolutely love a steam deck. And a significant portion of those would find it an upgrade over their laptop for Office and shit.
Vertical mice. I had occasional wrist pain from using a computer, which was annoying since then I'd had to take a break from the computer for about a day to recover. Got a vertical mouse and haven't had any issues since. Took maybe a day to get used to it too.
Honestly USB C adapters. If you EDC a portable power bank it's worth looking into a USB C to micro and thunderbolt adapter. It's a lot easier than carrying around multiple cords and an easy way to help out friends and coworkers.
I think I got mine for a few dollars on Ali Express
Not exactly sell but Linux tbh. I feel like most people would agree with all the justifications I have but am too drunk to type for not using Microsoft or Apple but simply are not aware of how much these monopolies of the tech market encroach on their privacy. More people need to be aware and take action
My mind was blown when I found this little plastic ball in a sports store which you can put between your back and a wall and you can massage yourself. It works wonders within even seconds of using it. It's only a few euro and I used to waste hundreds of euro on massages. And you can take it anywhere because it's small and light.
Good flashlights. You can get a great one that's rechargeable and super bright for something like 30€. At the same price you can get a crappy one at your local hardware store which is the options most people choose.
It wouldn't be everybody's cup of tea, but purely from a "not enough of even their target audience knows about it," I'd have to say the CharaChorder One.
CharaChorder makes chorded input keyboards to increase typing speeds (chorded input is when you press a couple of keys simultaneously, and it autofills a whole word mapped to that key combo - great for long-but-common words).
The CharaChorder One version (as opposed to CharaChorder Lite) actually has a completely different format, and almost resembles an arcade machine's controls if every finger on each hand gets one or two joysticks to control. This obviously nets it a steep learning curve, which is probably a major reason it hasn't picked up steam, but it's great for normal issues like carpral tunnel, or accessibility issues where you have limited hand movement. It also has an ambidextrous mode where you can set all the normal keys to one side of the keyboard, which is, again, great for accessibility, but also if you want to have your free hand on a mouse or... something..... else.......
Mass transit expansion (through government action, public will, and yes, taxes) over the mandate for everyone to contribute an expensive private car to the ever-growing asphalt hellscape.
I'm not proposing nobody knows about bicycles or anything but it's sort of odd how often I come across some type of [scenario perfect for bicycle] post that asks whatever they should do