Lowes has GE Zigbee In-Wall Wireless Smart Lighting Control light dimmer for $10 and the light switch for $9. I was able to pickup a few at two different locations for that price. Other stores around me had it higher so YMMV.
Dimmer:
GE ZigBee 15-Amp 3-Way/4-Way White Rocker Residential/Commercial Light Switch
https://www.lowes.com/pd/GE-ZigBe…1000097
Switch:
GE ZigBee 15/20-Amp 3-Way/4-Way White Rocker Residential/Commercial Light Switch
https://www.lowes.com/pd/GE-ZigBe…1000097
Brickseek
Dimmer:
https://brickseek.com/lowes-inven…1000097
Switch:
https://brickseek.com/lowes-inven…1000097
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