ThundeaL PG500 1080P Android Projector (Banggood, Aliexpress: [Android OS] ThundeaL PG500 Full HD 1080P Projector Portable WIFI Android Projector 2K 4K Video Home Theater Movie Cinema Big Screen Beamer – EU Plug (the best price with coupon)).
Go down and check coupons out. Remember to check price history if it is available. What is the 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 coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e, BGsaleSaS, BGSaleFeb8, BGSaleAD, BGa5e78e, BGMARCHSALE, BGProjcc, BG194a55, BG66949d, BGce5aeb
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for ThundeaL PG500 1080P Android Projector. The lowest price was: $129.99.
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)).