Wireless Key Smart Light Control .
Check coupons or create price alert down below. 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. ($22.94): BGSHOM15
2. ($24.29): BGHONEY2110
this code has to be applied in your 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): 10XMA, vipupgrade8, affiliate6, aff7off, bgssaff9, BGaDmITAd, BGBFAFF2019, BGCITYADS2019, BGAQ20, 0e7f33, BGAQSWN, BGSAMH, BGAQA15, bGhOnEy10, BGSM15, BGSMOFF, BGELIG0920, BgcLuBofErtA10, BGAFF10OFF, BG15SH12, BGSTHO15
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi QBKG03LM Aqara Double Wall Switch Neutral Line. The lowest price was: $16.99.
Price records source(s): Gearbest, 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)).