 Online retailers are using your data to charge you more. Here's how to outsmart them. Many major retailers use dynamic pricing that changes based on your location and device, meaning you might be paying a higher price than your friend the next town over for the exact same thing. They also track your internet activity, driving prices up when you check on something more than once and down when you compare prices with competing sites. And this happens with everything, including electronics, concert tickets, travel, and even groceries. To avoid being targeted, disabled tracking and location services on your browser switched to private mode for shopping, and always try a few different browsers and devices before making big purchases.