I'm in a (paid) Discord server that notifies people when Amazon / etc. prices hit a certain discount from the mean. I got a 65' 4K HDR TV for $300, when the list price was $3000. I always assumed these were marketplace sellers fudging a number when updating a listing, but we experienced some of these "death spirals" another comment was talking about in real time. Walmart was notorious for price matching other sites and you'd be able to get some electronics for a steal for a weekend before an employee caught it. The typical fulfillment rate was around 50%, with most orders being refunded within 24 hours.