Supplier for Height-Boost Formal Shoes

I’m developing a line of formal footwear that discreetly adds 2-4 inches of height without compromising style or comfort. My immediate priority are boots, but I ultimately want a supplier capable of expanding the range within the formal category once the flagship model proves itself... (Budget: $30 - $250 AUD, Jobs: AutoCAD, CAD / SolidWorks, CAD/CAM, Fashion Design, Manufacturing, Product Design, Product Development, Prototyping, Solidworks, Sourcing)