Amazon cuts an extra $20 off when you spend $100 or more on Kidde safety products. (Discount is applied automatically in-cart.) Plus, all orders that qualify for the discount receive free shipping. If you keep your purchase near the $100 threshold, that beats our July mention of an extra 15% off a much smaller selection and yields the biggest discount we've seen on these items at Amazon. Deal ends January 31. A couple of best bets, both eligible for the discount:

• Kidde Nighthawk Combination Smoke/Carbon Monoxide Alarm for $35.45
• Kidde Three-Story Fire Escape Ladder for $52.99