Contrast Ratio 1500: 1, Native Resolution 3840 × 2160, RJ45, Interface 3.5mm Audio, HDMI, Projection Distance 0.1 – 0.5m, Speaker, Model S3, Material Aluminum Alloy, Bluetooth Bluetooth 4.0, Throw Ration 0.233: 1, Resolution Support 4K, SPDIF, Display type DLP, WIFI 802.11 b/g/n/ac, WiFi, Function 3D, USB, Image Size 100 – 500 inch, Picture Formats JPG/PNG/BMP, DVB-T, Bluetooth, Image Scale 16: 9/4: 3, Brightness 3000LM.
Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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.
Link: Banggood product page
1. ($2797.37): BGAFF7OFF
2. ($2998.92): 7bcdf9
3. ($3000.92): Email5
4. ($3000.92): bGhOnEy10
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): aff7off, BGaDmITAd, bgchinafest, BGS301, BGS34K, BGBinkupon123, BGBFAFF2019, BGCITYADS2019, bGpAnDacHeCk, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for JmGO S3 4K Laser Projector English Version is here. The lowest price was: $2402.
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)).