I have checked all old coupons and price is $23.99 for SONOFF TRVZB Smart Zigbee Thermostatic Radiator Valve (in Banggood). Check coupons or create price alert down below. Do you want to know what the best price is?
Latest coupon code price check (UTC time):
SONOFF TRVZB Smart Zigbe Thermostatic Radiator Valve Intelligent Thermostat Temperature Controller APP&Voice Control Work with Alexa Google Home
Banggood ($23.99)
Banggood warehouse is located in China. Is it a low price? I have never seen better price than the current one in CouponsFromChina database, so it’s the best! You can get coupon down below.
Link: Banggood product page
Price without coupon: $25.99
1. ($23.99): BGca82bd
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG6bd0d3, BGfe40ba, BG0fdb5f
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – SONOFF TRVZB Smart Zigbee Thermostatic Radiator Valve [EU] ($-3)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for SONOFF TRVZB Smart Zigbee Thermostatic Radiator Valve is here.
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)).