Just check coupons out (with price alert and history). What is the best price?
HD 2.0 (Supports HD 2.0 input / max support 4K signal input)x1;, Keystone Correction: Auto/Manual Vertical keystone / Manual Corner Keystone, Light source: RGB 3LED / long life, Weight: 550g/1.2LBS, CPU: MTK9632 / Decode 4K H.265/VP9 4K*2K/30HZ, Light life time: 30000hours, Blue Tooth: BT 5.0, Resolution: 854*480 (WVGA) /Max support 4K video signal input, Project Dimension: 30-150”, Projection Mode: Front/ Rear/ Ceiling front/ Ceiling rear, Memory: RAM 2G DDR3 / ROM 32GB eMMC, DC-in 12V/2A, Power consumption: 10W, USB(Read Data from USB SSD Hard Drive /Support Mouse and Keyboard Control)x1;, WiFi: 2.4G & 5G dual-band WiFi, Headphone Output (3.5mm connectors / Audio output)x1;, Wifi-display: support Airplay/Miracast/DLNA protocol /wifi-display for smartphone, Project distance: 0.2- 4.5m, Speaker: 5W * 2 / Stereo output, Projector size: 78mm * 78mm * 140mm(3inch * 3inch *5.5inch), Brightness: 280 ANSI lumens, Light engine: DLP 0.3″ DMD, Contrast Ratio: 2 /500: 1, Throw Ratio: 1.4: 1, Android 9.0 OS
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):
Banggood
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now…
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): 7bcdf9, BG1059bf, BGProjectors, BGAProjector, BG3e622d, BGPROBuscape, BGDIH216, Cityads2210
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for BYINTEK P20 Mini Smart DLP Projector? There we go.
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)).