Prime Day is almost here. For two days in July, you’ll find promotions on products from companies big and small, all vying for your clicks and your wallet. Many will claim that they’re great deals, and that you’ll be missing out on big savings if you don’t buy the item during Prime Day. But there are a few strategies you can use to quickly find out if that “great deal” really is all it is.

One of the best things you can do to determine if a Prime Day deal is legit is to use a price tracker. These sites and tools track the prices of a particular product across the many different stores and retailers where it’s sold to give you the best possible price, and to let you see if that current “deal” is really that much lower than the original price or other deals out there.

A common technique to make deals look good is to inflate the price of the product: that way, when the company drops the price for something like Prime Day, it can claim a big discount even if the total price tag isn’t much lower than the original price (if it is lower at all). If something was originally $60, a company might raise the price to $75, then drop it back to $60, and claim it saved 20%. It’s accurate, but nasty, so be careful.

You can use a browser extension like Keepa to see a product’s price history. But other trackers, like Honey or Capital One Shopping, can help you find prices and price histories for items across multiple stores. Their browser extensions are especially useful: If there’s another store selling the same item you’re looking at on Amazon for less, you’ll get a pop-up letting you know, with a direct link to that store’s product page.