You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Color Black, Net weight 133g, Infrared frequency 38kHz, Wireless connection Wi-Fi IEEE 802.11 b/g/n 2.4GHz, Power input 5V—1A, Product size 100x 100x 26mm, Working temperature -10 ° C ~ 50 ° C, Product material PC
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. Well, there is one coupon available right now.
Link: Banggood product page
1. ($18.69): BGeLt15
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGXMRBC, 502C6B, TISPrime01, Tools1, Tools3, BG111BB, BG9922, BG2020NS, BGBN2, BG2SB2, BGHN2C, BG22SP, BG2MFC, bGhOnEy10, BGdragonBoat, BGSS10%SW, BGEES11, BGWow101
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi Mijia Universal Remote Controller Switch [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mijia Universal Remote Controller Switch.
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)).