[MPWR]

Be aware that international copyright laws allow you to make as many copies of a part for yourself, but prohibits distributing copies you've made of someone else's part to other people.

Casting your own is a good option- however I would warn that drilled rotors in particular are difficult to copy, because air bubbles like to adhere to the drilled holes when making the mold. This can be mitigated with a vacuuum pump for creating the mold, and a pressure pot for the casting, but these techniques are beyond the means of most individuals.