You can create price alert here, copy coupons and view price history. What is the best price?
Card Users: 100pcs, Available color: Black / Red Bronze, Model: S1, Unlock modes: APP / Fingerprint / Password / IC card / Key（The normal version does not support APP））, , Panel Sizes: H 240(mm)x W60(mm), Power supply: 4x AAA 1.5V batteries（Battery not included）, Material: Aluminium Alloy, Fingerprint Users: 100pcs, Fingerprint read: FPC Sensor (Semiconductor Sensor), Password Users: 100pcs, Suitable door thickness: 35-50mm, App name: Tuya app /
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
1. ($100.57): BG589b2e
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG00c906, BG04ab30, ADMITAD2212, 2022ACTIESNL, BGAlerabat1, Terence, 8Couponsde, MVC8SPRING, tRaDetRaCKeR, 8wEbgaInS5, BGHU2104, pROMo8cuPoN, hoNEYbGdeAlS, BGJUNEGSG9, BG046309, BG8ReviTrage, Cuponation9, BgGoodie9, BGcoupon8off, BGGutscheine, TTBLACK5
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Check out price history chart (for all/most countries) for Tuya WiFi Fingerprint Smart Door Lock.
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)).