 The secret stores won't tell you about their Black Friday sales. Some companies make lower quality versions of their top sellers specifically for Black Friday, kind of like they do with outlet malls. And that knockoff might have lower quality parts and fewer features. And because they're new models, they're mostly untested and unreviewed. To make sure you're getting the product you think you are, search the model number online. If only Black Friday deals pop up, that's a bad sign because...