$100 off drops the Galaxy A57 to $449 for 128GB and $509 for 256GB at Samsung's US online store in a limited-time sale.
Samsung is offering the discount without requiring a trade-in, making the mid-range phone cheaper than its usual $549 and $609 starting prices.
Trade-ins can save buyers up to $196 instead, but that offer cannot be combined with the $100 instant discount.
US buyers can pick from Awesome Icyblue, Awesome Navy and Awesome Gray, while Samsung Financing remains available for those avoiding full upfront payment.