Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Aqara OPPLE WXCJKG13LM Smart Switch Six Button (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (15.29 USD): bGhOnEy10
Coupon (15.29 USD): BGSS10%SW
Coupon (15.29 USD): BgcLuBofErtA10
(CouponsFromChina.com tip: just apply this code 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): bgaqraled, BGCITYADS2019, AFfbG10, BGVDay10%off, BGLIGHT2020, BGAQA15, BGdragonBoat, bgshOOp10, BGLIGHT0920, BgoFErTaSchInA10, BGELIG0920
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Aqara OPPLE WXCJKG13LM Smart Switch Six Button (-3 USD)
Price history and price alert
Do you need price history chart (for all/most countries) for Aqara OPPLE WXCJKG11LM Smart Switch Double Button? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).