Price history, coupons and price alert are available on this page. What is best price?
Brightness 7800 Lumens, motorized adjust Focus /projector has a motorized adjust Focus facility., 3D Function: Support red blue 3D, Brightness: 7800 Lumens / 780 ANSI lumens, Light source: 50000 Hours long life, Native Resolution: 1920*1080dpi, Contrast Ratio 18000: 1, LCD Screen Size: 6.3 inch TFT LCD Screen
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):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($244.39): BG589b2e
2. ($244.39): BGProjcc
you should apply the coupon in your 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): BG0db549, BGProj, BGSaleFeb8, BGSaleAD, BGMARCHSALE
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Thundeal YG550 1080P Projector Android 9.0 1/16GB.
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)).