We’re going to be totally honest with you. We don’t mind spending our hard-earned money on expensive products, as long as they work. But it’s a good day when we find one that is not only effective but also easy on our wallets. From what we can see, our fellow beauty junkies feel the same. Topping the list of best-selling face masks on Amazon is one that will only set you back $10 (well, $9.45 to be exact) for an entire pound of hard-working product.