The long-awaited beauty sales for Amazon October Prime Day 2024 (or, as Amazon is calling the event: "Prime Big Deal Days!") are finally here and I, a professional skin-care, hair-care and makeup shopper, have scoured the site for the best name-brand deals on all your favorite products. From a legendary exfoliating foot mask to an innovative hair-straightening brush that's nearly 75% (!) off, we've got the beauty-insider scoop on the best deals to shop today.