Sears offers the First Alert Plug-In Carbon Monoxide Alarm with Battery Back-Up, model no. CO605, for $11.96. Opt for free in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find by $10. It features a silence button, front access battery compartment, and 7-day runtime on battery.

Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts. Plus, Shop Your Way Max members are eligible for free shipping.