You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
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 code price check (UTC time):
1800 Lumens 1080P Home Theater Amlogic S905X Android 6.0 BT4.0 HDMI Support 4K Video
Price history and price alert
Price history (for all/most countries) for Alfawise A8 Smart Projector Android Version [Fast-23] 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)).