APP Name BroadLink, Infrared Range ≤8m, Standby Power ≤0.69 W, Communication Mode WIFI 802.11b/g/n (2.4Ghz), Input Current 750 mA, Gross Weight 100g, Support OS IOS 9.0 / Android 4.0 and above, Model RM4 Mini, Size 8.5*5*6.5cm, Net Weight 80g, Infrared Frequency 35Khz, Infrared Direction Multi-direction infrared, Working Humidity ≤85%, Input Voltage DC5V, Brand BroadLink.
Price history, coupons and price alert are available on this page. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($22.99): tRaDetRaCKeR
2. ($22.99): 8wEbgaInS5
3. ($23.24): 2203ActiesNL
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGe446b3, 13f142, BG9e1984, BGcd5218, BG82504, BG83104, BG090804, BG035cd2, BG1999b1, BGD11062, BGB5073, BGc2705f, BGbabab0, ADMITAD2212, BGSmart6, 8Couponsde, MVC8SPRING, 8BGwbg2204
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for BroadLink RM4 Mini IR Smart Home Universal WIFI Remote Controller. The lowest price was: $15.99.
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)).