Welcome to the forum.
Your motor looks like a dc brushed motor not a brushless.
A brushless has 3 wires, brushed usually 2 wires.
You can get speed controllers for both types off ebay, brushless however tend to run at high revs, as a popular application for them is model aircraft.
Some do, but some have only 2 wires and internal commutation circuitry.
Speed control of a 2-wire brushless motor using a typical ebay controller may not work well if PWM of the controller conflicts with the internal commutation. Might be worth contacting the motor manufacturer for their advice on speed control.