Nothing is more frustrating than buying a new pair of headphones or an OLED TV, only to find out you could have gotten it cheaper somewhere else a few days or weeks later. That’s why, to keep customers happy and prevent them from shopping elsewhere, some retailers offer price-matching policies that promise to match a lower price found elsewhere. That kind of information comes in handy year-round, but it’s especially helpful during the weeks of deals leading up to Black Friday and Cyber Monday.

Below are the price-matching policies for several major retailers. A few things to note: First, each retailer has its own set of rules and restrictions. We’ve summarized some of them here, but we recommend visiting the provided links and reading the policies carefully. Second, most retailers that serve as marketplaces for other sellers, including wholesale retailers like Costco, don’t offer protections, and many traditional stores won’t match their prices.