Aliexpress
Click here… to search for Cheerlux C7 Projector on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (73.94 USD): BGPROBuscape
Coupon (78.29 USD): BGAProjector
(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): 07c104, e2bcea, BGCXC7, TECH8%, aff7off, BG3CSUM, BGaDmITAd, bgchinafest, BGBFAFF2019, Email5, bGhOnEy10, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10, BGAFF10OFF, 7d18f7, 13f142, BGProjectors
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for Cheerlux C7 Projector.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).