Looking for products on Amazon is a loophole.
Amazon prices are competitive. They often match offers from other vendors automatically. In Spain, for instance, they match MediaMarkt's discounts to the cent.
The issue is that offers and discounts are not always real discounts. Amazon may have a 100-euro product listed at 60 euros (40% discount) when in reality, everyone's selling the product at that price now, and 100 euros was when the product was released. It's not a discount; it's the product's current price.
What I want to do is remember the different Amazon prices I saw when visiting the product or even adding it to the shopping cart.
The idea is to create a Google Chrome extension to track the price of an Amazon page when I visit it, creating a log of actual prices. That way, when you return, you can know if that fifty percent off is an actual sale.