You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Connectors USB, Bulb Type LED, Aspect Ratio 16: 9, Product Detail, Native Resolution 1080P (1920×1080), Sub Categories Home Theater Projector, Languages Chinese, Throw Ratio Range 0.17, Brightness Range 4000 Lumens & Above, Digital Keystone Correction ±40°, ROM 16GB, Pre/On Sale On Sale, Use set top box can play the local language video, Projection Technology DLP, Speakers Included Yes, Projection Distance (m) 0.5-5, Video Format Resolution 4K, Contrast Ratio 10000: 1, Brightness (lm) 4200, Wireless same screen, Features Android system, CPU Cores Quad Core, Input Voltage (V) 100-240, System Configuration, Projection Screen Size (inch) 40-300, RAM 2GB, built-in, Model S21, Power (W) 380-460
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
New Remote Control For JMGO E8 V8 S2 G3 T6 P3 C6 A6 S21 S2 S60 J6 Smart Home Theater DLP LED Projector | $6.56 | – |
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.
Link: Banggood product page
1. ($2735.22): BGAFF7OFF
2. ($2932.10): 7bcdf9
3. ($2934.10): Email5
4. ($2934.10): bGhOnEy10
coupon code has to be applied in shop’s 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): BGJmGOS21, bgssaff9, aff7off, BGaDmITAd, bgchinafest, BGBFAFF2019, BGCITYADS2019, bGpAnDacHeCk, BGMPB2020, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for JmGO S21 DLP 2/8GB Projector is here.
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)).