

This is actually a common thing and has been around for awhile. I see it on amazon mostly. Seen it on Microcenter’s website a number of times as well. Newegg was big on doing it when they were more PC focused and not a chinese website. Was more prominent in the early 2000s as there were more competing online stores back then.
US thing. It’s a loophole vendors will use to get below contracts with manufacturers so they can clear stock and not actually be publicly displaying the sale price. Keeps them from getting sued by the manufacturer and the consumer ends up with a better deal.