Check coupons or create price alert down below. You probably want to know what is the best price?
Native resolution: 1280*768, Support: 1080P, Brightness: 4500 LMS, Voltage: 100-240V, Aspect Ratio: 16: 9 & 4: 3, LED Lamp: 200W/20000hours, Power consumption: 200W, Projection ratio: 1.4, Contrast Ratio: 1500: 1, Noise: 54DB
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($273.99): 7bcdf9
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 921BGM5P, TECH8%, 7f09ac, BG3CSUM, BGBFAFF2019, BGCITYADS2019, aff7off, bGpAnDacHeCk, Email5, bGhOnEy10, BGdragonBoat, BGAFF7OFF, bgshOOp10, BgoFErTaSchInA10
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for M5 LED Projector 4500lm.
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)).