Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (1620.25 USD): BgoFErTaSchInA10
Coupon (1674.26 USD): BGAFF7OFF
Coupon (1674.26 USD): bgshOOp10
Coupon (1793.28 USD): Email5
Coupon (1793.28 USD): BGAFF10OFF
(CouponsFromChina.com tip: apply code in your basket (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): BGXGRSP, aff7off, BGRSP140, BGaDmITAd, bgchinafest, BGRSP141, BGBFAFF2019, BGCITYADS2019, bGpAnDacHeCk, bGhOnEy10, BGdragonBoat
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for XGIMI Aurora RS Pro DLP XJ03C Projector is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).