The best way to buy used products since web 1.0 has either been craigslist (local, negotiating) or ebay (online auction). But both are terribly run companies that have let their business models fail. Sadly, they&#x27;re the de facto market leaders, and network effects mean they won&#x27;t easily be replaced or &quot;disrupted&quot;.<p>IMO this isn&#x27;t a failure of auctions, it&#x27;s a failure of ebay.