Aliexpress
Click here… to search for ViviBright GP100 Projector Basic on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (199.01 USD): BGAFF7OFF
Coupon (204.99 USD): 7bcdf9
Coupon (206.99 USD): Email5
Coupon (206.99 USD): bGhOnEy10
(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): BGGP100, e1dbb7, PICODICOM, TECH8%, 24a8fa, cc1725, 7f09ac, bGpAnDacHeCk, 2108b4, aff7off, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10, BGAFF10OFF
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for ViviBright GP100 Projector Basic.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).