Getting parts at cost? So I could find some manufacturer using a part I want and order it at their cost rather than having to go to a retailer? Is there anyth

Getting parts at cost? So I could find some manufacturer using a part I want and order it at their cost rather than having to go to a retailer? Is there anything that allows a manufacturer to require you send in the broken part after or any limit to how many times something can be "repaired"? Because I'd like to purchase a very large number of NVIDIA GPUs at cost.