Powder Coating Systems are relatively cheap all around. The only problem is you will need an oven large enough for what you want to powder coat. And those can run anywhere from $200 to a couple thousand depending on size, heating source and so on... I know Harbor Frieght has one large enough to fit ONE rim at a time for around $300-$400.. Lastly, I've seen people build there own ovens for about $500 out of Home Depot parts +some, that can fit large items...