Xiaomi Wemax C700 4K Laser Projector (Banggood, Aliexpress: Lamp: ALPD, Max. Extended Capacity: 64GB, SPDIF, Digital, Home Theater, Bluetooth: Bluetooth 4.1, Entertainment, Headphone/Microphone Jack-, Native Resolution: 3840x 2160, PORTABLE, iPhones, Image Scale: AUTO, 3.5mm Audio, Features: Wireless, Audio Input, Laser, Operating System: Android, Projection Distance: 14-50cm, Image Size: 80-150 inches, Laptop, Earphone, Power Supply: 200-240V / 50 – 60Hz, Main Materials: ABS, Application Scope: Home, Contrast Ratio: 3000: 1 – 4000: 1, Type: Short-Focus, WIFI: 802.11 a/b/g/n/ac, PC, Lamp Power: 330W, Package Weights: 9.2KG, USB, Aspect Ratio: 16: 9 / 4: 3, Display Type: DMD, Model Number: C700, Compatible with: Mobile phones, Package Sizes: 56.8×47.5×18.3cm, Resolution: Support 4K, Tablet PC, HDMI, Interfaces: USB3.0, Throw Ration: 0.233: 1, Noise (dB): 38dB (the best price with coupon)).
Price history, coupons and price alert are available on this page. Do you want to know what the best price is?
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.
Link: Banggood product page
1. ($3890.06): 7bcdf9
2. ($3892.06): Email5
3. ($3892.06): BGAFF7OFF
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): BGCL700, aff7off, BGBFAFF2019, BGOPcoupon101, BGCITYADS2019, bGpAnDacHeCk, 2880c7, BGMPB2020, bGhOnEy10, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Wemax C700 4K Laser Projector. The lowest price was: $2799.99.
Price records source(s): Gearbest, 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)).