Aliexpress
Click here… to search for Xiaomi HAGiBiS HABH1901 Wireless Display Dongle on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
Coupon (36.20 USD): aff7off
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BGDongle, 1225CAR, 502C6B, BGoffice1, PICODICOM, BGPAYPALSS, BGaDmITAd, BGBFAFF2019, BGCITYADS2019, 0e7f33
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi HAGiBiS HABH1901 Wireless Display Dongle.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).