Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – GUUDGO Tuya APP Smart WiFi GSM Home Security (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I can’t tell you if this price is good – not enough records in my database, so I won’t judge.
Link: Banggood product page
Coupon (44.99 USD): BG28178d
Coupon (50.04 USD): Cuponation9
Coupon (50.59 USD): BG8ReviTrage
Coupon (51.69 USD): BG00c906
(CouponsFromChina.com tip: apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, BG62e7b5, BG46507f, 00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, BG79dd11, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, hoNEYbGdeAlS, BGJUNEGSG9, COUPONSDE1wk, BGcoupon8off, BGGutscheine, BG8OFFCOUPON, TTBLACK5, BG589b2e
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – GUUDGO Tuya APP Smart WiFi GSM Home Security (-3 USD)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: 40.99 USD.
You can set price alert (for Banggood).