I have checked all old coupons and price is $10.99 for Tuya WiFi Smart Switch Module 1 Gang (in Banggood). Get coupons, create price alert or check price history out! You probably want to know what is the best price?
Voice Control: Compatible with Alexa Google Home, Operation Humidity: ≤90%, Rated Voltage: 100~240V 50/60Hz, Shell Material: PC/Flammability Rating: V0, Operation Temperature: -10~40℃, Rated Current: 10A, App: TuyaSmart/Smart Life, Physical Two-way Control: Support, Size: 39.2*39.2*18mm, WiFi Standard: IEEE 802.11 b/g/n 2.4Ghz Only
Latest coupon and price update (UTC):
Banggood ($10.99)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. I think you want to know if the price is good. This price is higher than average price ($9.54) for this item.
Link: Banggood product page
Price: $10.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG1534df, BG7fbb5b
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
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 Tuya WiFi Smart Switch Module 1 Gang 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)).