plastic gear wheel

An RC plane/enthusiast shop would be a good start. Add your location too so that users from your locality can add details like specific shops and such.
 
Robu.in has a 72 piece gear wheel for sale. They also do 3d printing I reckon.

https://robu.in/product/75pcs-gears-assorted-kit-for-diy-robotics-and-household-repair/

context of the question
 
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