Found a few deals for Smoke, prices very by store from 50% to 75% off see brickseeks:
As with all these current lowe’s deals YMMV
Best deal:
First Alert Onelink AC Hardwired Photoelectric Combination Smoke and Carbon Monoxide Detector with Battery Back-Up for as low as $29.99
Brickseeks 8% Stock
First Alert Battery-Powered 3-Volt Photoelectric Sensor Smoke Detector for as low as $12.49
Brickseeks 21% Stock
First Alert Battery-Powered 3-Volt Photoelectric Sensor Smoke Detector for as low as $8.74
Brickseeks 19% Stock
Below can be found lower if 75% off, found 50% around my area:
First Alert AC Hardwired 120-Volt Smoke Detector $7.99 or lower
Brickseeks 9% Stock
First Alert Battery-Powered 3-Volt Photoelectric Sensor Smoke Detector $12.48 or lower
Brickseeks 26% Stock
First Alert Battery-Powered Photoelectric Combination Smoke and Carbon Monoxide Detector $22.79 or lower
Brickseeks 23% Stock
First Alert Battery-Powered Photoelectric Combination Smoke and Carbon Monoxide Detector $24.99 or lower
Brickseeks 19% Stock