To ensure you get the absolute best Black Friday and Cyber Monday deals, be sure to check the model numbers, says Today. Especially in electronics, companies often offer a near-identical stripped-down model that isn’t what you want or the deal you think it is. You can also check an item’s price history to see if it has been just as cheap in the past. For online shopping, try clearing your browser’s history or using private browsing to ensure you get the latest markdowns. And if you find an amazing “doorbuster” deal on something you really need, buy it fast before it sells out.