Basically copy coupon, view price history or create e-mail price alert. Best price?
Contrast Ratio 2000: 01: 00, Evenness ＞ 75%, Projection Distance 2-6m, Noise 40~45db, Built-in Speakers 5W*2 / built-in sound cavity / high-quality sound effects / stereo left and right channels, Keystone correction Electronic keystone correction, LED Life 20 /000-50 /000 H, Video format vob/mkv/mpg/mp4/mov/avi etc, Projection Mode Front, Native Resolution FHD 1920*1080P, Focus Mode Manual, LED Source LED, Optical Instruments Newest opto-mechanical Seal Tech, Image format JPG/GIF/BMP/PNG etc, Operation System Android Version–(Android 6.0 OS (1G+8G), Projection Technology LCD (Converged new technology), Other Control Front and rear IR remote control, LED Luminance 400 ANSI Lumens, Projection Size 50-150 inch, Audio format MP3/WAV/WMA etc, Aspect Ratio 16: 09, Projection Ratio 1.6: 1
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($252.44): BGPROBuscape
2. ($267.29): BGAProjector
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGa2e3d0, 7bcdf9, BG3fa8cb, BGProjectors
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for WEJOY L9 1080P Projector 1/8GB? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).