Aliexpress
Click here… to search for UHAPPY U76 Projector 1920×1080 on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (752.39 USD): BGAProjector
(CouponsFromChina.com tip: apply it 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): BGUNU76, aff7off, BGaDmITAd, bgchinafest, BGBFAFF2019, BGCITYADS2019, 7bcdf9, bGpAnDacHeCk, BGMPB2020, Email5, bGhOnEy10, BGdragonBoat, BGAFF7OFF, bgshOOp10, BgoFErTaSchInA10, BGAFF10OFF, BGProjectors, BGPROBuscape, BGLaurent, Cityads2210, Tabby20
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for UHAPPY U76 Projector 1920×1080 is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).