The parts used in the projects in this blog are from a variety of sources, and ones I continue to use are listed below. This is not an exhaustive list, but amongst the sites I go to when I need parts.

Most of the sensors, Arduinos and Raspberry Pis are sources form Pi Hut, and are usually very quick to deliver.

Like Pi Hut, Pimoroni stocks sensors, Raspberry Pis and lots of useful accessories. Also quick delivery.

My 3D printer is a Prusa MK4S and I tend to use Prusa filament too as it is consistently good quality. Can take a week to deliver, but worth the wait!