Would you mind elaborating and specifying which industries or resources you experienced these problems? This sounds like something that a startup could target.
I would say look up consumer-plastics, like high-quality cups and pens. I'm not talking about the use once and toss away stuff: think Tervis-style items or things made with tritan. It gets considerably more complex if you only target items that are eco-friendly, then add in imprinting and the world gets exceptionally complicated.
Another issue is mold-creation, which is separated from manufacturing in many cases and also very expensive. The piece-counts are usually tolerable. The fact is that China can do custom molding much cheaper and many US companies refuse to do it at all.
I've also discovered that many companies will straight-up lie to you about USA-made items as well. The company I worked for recently caught one person lying about this stuff, so there's that element as well.
