I have just checked coupons. The lowest price I could get is $66.99 for W2 Tuya Smart WiFi Door Viewer Wireless Video Doorbell (in Banggood). You can create price alert here, copy coupons and view price history. Best price?
Wireless WiFi: IEEE802.11b/G/N 2.4GHz, Surveillance intercom: Support, Applicable door thickness range: 35-100 mm, Battery capacity: ≥3000mAh, Screen specifications: 4.3 inches / IPS / 480*272, External storage: Micro SD card (maximum support 128GB), Processor: Hi3518E, Charger: 5V/2A, Imaging chip: 720p, Memory: RAM 512M, Mobile detection: support, Suitable for door holes: diameter 14-35 mm, Night Vision wavelength: 940nm (invisible light), Operating system: liveOS
Latest price update (UTC time):
Banggood ($66.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? Is it a low price? Well, this price is higher than average price ($62.30)
Link: Banggood product page
Price: $66.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BG8FORMULAMX
(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
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Tuya Brazil WiFi Smart Switch with Socket, Touch-Sensor Smart Home Interruptor Wall Switch Work for Google Home(W2) | $27.25 | – |
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for W2 Tuya Smart WiFi Door Viewer Wireless Video Doorbell.
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)).