$14.99 – Tuya Zigbe Smart Knob Wireless Scene Switch Button Control Dimmer Battery Powered Automatic Scene Smart Life APP.
According to my DB the lowest price is $14.99 for Tuya Zigbee Smart Knob Scene Switch Button (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Do you want to know what the best price is?
Latest price update (UTC time):
Banggood ($14.99)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. What about the price? Hmmm, price is higher than average (which is $13.49 right now), so better set price alert down below…
Link: Banggood product page
Price: $14.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Tuya Zigbee Smart Knob Scene Switch Button. The lowest price was: $12.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).