First Alert SMI100 Battery-Operated Smoke Alarm $10 at Amazon $10 $17 Amazon has the First Alert SMI100 Battery-Operated Smoke Alarm for $17 - 40% off coupon (click checkbox) = $10 with free shipping on $35+ or with Prime. Other First Alert models w/ the same 40% coupon include: 10-Year Sealed Battery Smoke Alarm (SMI110) for $13 Hardwire Interconnect Smoke Alarm w/ Battery Backup for $14 Interconnect Hardwire Smoke Alarm w/ 10-Year Battery Backup for $18 $10 retail: $17 Report Posted by Faraday04/16/2024 at 08:22 AM PT