Check Craigslist or Facebook Marketplace, I see pretty good 5.1 receivers go for $20 regularly. I saw one woman locally last week post, she had a dozen Blu-Ray/DVD players and 10 receivers (Yamaha, Onkyo, Sony). The most expensive was $20. After a week, she had sold two things, so she was selling the rest, along with 5 flat panel TVs "take them all" for $150. It's still there.