Aliexpress
Click here… to search for Xiaomi Aqara ZNGZDJ11LM Curtain Motor on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
Coupon (109.99 USD): BGf6736a
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): BGaDmITAd, aff7off, bgchinafest, BGBFAFF2019, BGCITYADS2019, BGBFAQR, bGpAnDacHeCk, 2020CNY, BGAQ20, BGSAMH, BGAQA15, bGhOnEy10, BGSM15, Email5, BGSMOFF, BGAQCG, BGSAMRTH, BGELIG0920, BgcLuBofErtA10, BG15SH12, BGSTHO15, BGHONEY2110, BGSHOM15, 13f142, BGSHE15, BGAQA929, BG9ea68d
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Aqara ZNGZDJ11LM Curtain Motor.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).