How much does this cost to the nearest dollar?

SYSTEM SENSOR 4WTA-B 4WTAB 12/24 VDC, Photoelectric Smoke Detector with Thermal, Sounder, and Base
The 4WTA-B is a photoelectric i3 smoke detector with thermal sensor and built-in sounder. Photoelectric smoke detector with plug-in design allowing pre-wiring before installation Drift compensation automatically adjusts sensitivity for dust accumulation minimizing nuisance alarms. Smoothing algorithms that adjust for short term spikes of smoke and dust minimizing nuisance alarms. Removable detector cover and chamber for easy cleaning Manufacturer System Sensor Unincorporated, Part Weight 0.01 Ounces, Dimensions 5.79 x 5.75 x 2.44 inches, model number Is Discontinued No, Color White, Style Low Voltage Smoke Detector, Power Source

Price is $91.00
Price: $90.99