It is purely depends on sizes, consumables and equipment that you are interested. For example, for an oven size measuring, 6 ft Breadth, 8 ft height, and 12 ft length with standard accessories like Gema Gun or Wagner Gun, 5HP Compressor, and trolleys, it costs around 10 Lakhs.
If you are planning to go for a conveyor type oven, it will cost you more.
If your purchase local-made powder coating gun, it costs half of the price when comparing to Gema or Wagner.
So, on the whole it depends on what product you choose.