If I read between the lines, your question is not just about the money (a couple of hundred dollars, every few months). It is a question about "What is the right thing to do?"
I don't have the perfect answer to your question. But I often have clients ask me questions about recycling and sustainability. Usually general questions, phrased something like "What should we do?". My stock answer to that question is, Anything and Everything.
My suggestion, give it away to someone who could put it to good use. That someone might be an artist working on an art project, a gardener looking for some inert material in a raised bed, a class of students studying climate change, a scientist exploring new methods of de-polymerization, a researcher studying whatever.
I often sell used things, on ebay and/or Craigslist. Mostly personal things, but sometimes surplus materials. Price is always something to haggle over (as are costs). But there is a funny thing about people, they always like getting something for free - even if they have to drive a few miles to get it. Every time I post something in the "Free Stuff" section of Craigslist, somebody offers to come pick it up, and put it to good use. (Well, almost every time).
Yes, in the grand scheme of things, a few hundred pounds of plastic scrap every few months is not much. But it is something. And if someone, somewhere, could put it to use, that's a win for all of us.
- EricP.S. I realize this thread is a few months old, but the question itself is timeless.
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