Us Weekly has affiliate partnerships. We receive compensation when you click on a link and make a purchase. Learn more! One thing about me: I can’t resist a good beauty deal. And when I know I can get it with two-day shipping à la Amazon Prime during the back-to-school sale? It makes things even sweeter. Sure, back-to-school season may conjure up thoughts of pencil cases, backpacks and perhaps a new wardrobe, but for beauty lovers, it’s the perfect time to stock up on skincare favorites, experiment with viral makeup formulas and give your hair routine a little refresh. Below, I’ve rounded up the best Amazon back-to-school beauty deals that…