Realistic Sci-Fi Game Art

I need 2D art assets for a sci-fi video game. The project focuses on creating immersive factory/lab-style machines and props. The main sprites I am looking for are machines with an input and output that physics items will be passing through... (Budget: $30 - $250 AUD, Jobs: 2D Animation, 2D Drawing, 2D Game Art, 2D Layout, Digital Art, Game Art, Game Asset Creation, Graphic Design, Illustration)