Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Aqara D1 QBKG24LM Zigbee Smart WIFI Wall Switch [EU] (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
Coupon (28.89 USD): BGSmart6
(CouponsFromChina.com tip: this code has to be applied 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): BGAQAD1S, BgcLuBofErtA10, BG15SH12, BGSTHO15, 13f142, BGHONEY2110, BGSHOM15, BGSHE15, BG0859c9, BGe02387, BGf5d5cc, BGAQA929, BGd324bf, BG10c204, BGD11055, BGB5067, BG479f9e, BG06aabb, ADMITAD2212
(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. Europe – Aqara D1 QBKG24LM Zigbee Smart WIFI Wall Switch [EU] (-3 USD)
Price history and price alert
Do you need price history chart (for all/most countries) for Aqara D1 QBKG21LM Live Line Zigbee Smart WIFI Wall Switch? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).