Metal Prototype 3D Modeling & Sourcing

I’m taking an existing concept into the prototype stage and need a metal-ready 3D model that can go straight to a machine shop or additive manufacturer. The file must capture every tolerance with high precision, hold up mechanically for repeated testing, and keep weight to an absolute minimum... (Budget: $250 - $750 USD, Jobs: 3D CAD, 3D Design, 3D Modelling, 3D Printing, CAD/CAM, CNC, Product Design, Solidworks)