Nearly all of the 1.75 dia pla is on sale on matterhacker, as well as the more you buy the better the deal. I don’t know if they have always done this, because I’ve never ordered from them, but I likely will soon.
https://www.matterhackers.com/store/c/1.75mm%20PLA%20Filament
It's an informative topic.
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skysmotor.co.uk sells the following products online: closed loop stepper motor, pancake stepper motor, servo motors, planetary gearbox and can be purchased online if required.