I looked into buying a DIY kit for making a mouse recently in order to easily repair it(, and eventually improve/customize it i.d.k., at least understand it better), but there's not much choice so i gave up and bought one at 30€.
you often find it is made of parts you can replace
But good luck to find these parts, they have a serial number but from my experience with a computer screen, the circuit board is really expensive and takes a long time to ship, so they told me to just buy a new screen(, it was only one of its ~4 circuit boards, and a small component of it furthemore, but everything was thrown out).
That's probably why most objects are just thrown away and people don't even attempt to repair them(, if it was cheaper that practice would probably be more widespread)
I have repaired my computer mouse recently
You opened it and found a spare part online for a cheap enough price ?
It must be a big(&unusual?) brand if they sell parts for their mouse online.
now they're like over $200
I'd have to look at the specs to see if the difference with a $40 mouse is worth paying 5 times more 🤷