Motor with appropriate gearbox required for plastics shreder build

Late last year I downloaded the designs for making a plastics shredder enabling shredding of various types of plastics.

Hoping to acquire an appropriate electric motor (preferably single-phase 10A 240V, could go as far as single-phase 15A 240v) before I start on getting the stainless steel shredder cut and built. The gearbox will need to be fairly low RPM with fairly high torque.

This project would enable raw materials for many different plastics projects including Filament, extruding, injection molding, large plastic pours etc

Let me know if anyone can assist with where I could acquire one for free or purchase a 2nd hand motor/gearbox at a reasonable price.