This is a somewhat misleading snippet claiming that
Ecommerce sites use personal info to charge you more. I don't know about other sites but I'm pretty sure Amazon has no such pricing capability. I'm an engineering manager responsible for the software services that manage all offers and prices at Amazon. Often products have multiple sellers each offering the item at different prices - these show up in the 'buy box' and the featured offer is rotated periodically. This might explain why a price changed. Also, sellers change their prices all the time. Also, one seller can go out of stock, and the next seller's offer would be featured and their price would be used. Many things can cause the price of a product to change.
Whatever happened to investigative journalism?