I sometimes find that I want a thing, especially the more maker-esque stuff, but have no clue about where I can get them.
This page, therefore, is just a collection of information on where you can find some of the stuff I've had problems figuring out in the past.
These are best found in Auto-Spare shops. There's a middling chance you might also find them in the local hardware.
All else failing, you can buy them online.