If someone sells to you they must operate under your state's laws. You can easily bring suit against them in small claims or real court, but you probably won't even need to do that as you can just get a chargeback.
What you are suggesting is absurd. Craigslist, Ebay, Paypal, and the people selling using those platforms are above the law?
I can see how you'd think that if you'd never tried to do any of these things, but in reality there's what the law says and then there's what you can actually get the law to do. Those are sometimes very, very different things. This is one of those times.
It sounds like you might not be familiar with any of the platforms in question. But no, you can't do either of those things to the kinds of people who deliberately sell defective parts on ebay and Craigslist. Or at least, you won't once you figure out what's actually involved.
I would say beside as opposed to above, but it sums to the same thing.
What you are suggesting is absurd. Craigslist, Ebay, Paypal, and the people selling using those platforms are above the law?