How much does this cost to the nearest dollar?

AMI PARTS 990-53 Solenoid Valve Assembly Water Valve-Compatible with GeneralAire Humidifier -1042 1042L 1042LH 1137
990-53 HUMIDIFIER WATER VALVE This is a 24 volt, AC electrically-operated valve that turns the water on and off to your humidifier.It controls the water flowing into the humidifier to ensure the right amount of humidity for your home DURABLE MATERIAL the solenoid is made of solid brass material, durable and sturdy, well-tested by the manufacturer.Non original aftermarket part. Fits OEM Standards EASY DIY INSTALL Easy installation only took 10-15 minutes, make sure to mark the wires so that you connect them back up the right way PERFECT IT This 990-

Price is $20.00
Price: $19.99