Aliexpress
Click here… to search for BroadLink BestCon RM4C Mini RF & IR Smart WIFI Remote Controller on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): aff7off, BG11RM4C, BGCITYADS2019, BGBFAFF2019, 13f142, BG9NY, bGpAnDacHeCk, 2020CNY, BGVDay10%off, BGBLRM4C, BGSAMH, BGBLKRA, bGhOnEy10, BGRM4C, BGILBK12, BGSMOFF, BGBLR4CM, BGSAMRTH, BGELIG0920, BgcLuBofErtA10, BGBDRM4CE, BGAFF10OFF, BGBLR4MI, BG15SH12, BGRM4CFRZ, BGSTHO15, BGBLRM4CS, BGCuponation10, BGHONEY2110, BG7cd85e, BGSHOM15, BG3c33ff, BG701dae, BG3c19f8, BGb5d2ff, BGD11068, BG9d7a18, BGB5079
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for BroadLink BestCon RM4C Mini RF & IR Smart WIFI Remote Controller.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).