Just check coupons out (with price alert and history). What is best price?
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):
Native Resolution: 800x 600, Brightness: 1800 Lumens, Lamp Power: 36W
Price history and price alert
Price history (for all/most countries) for S320 LCD 1800lm Projector White [Fast-29] is here.
Price records source(s): Gearbest
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)).