Go down and check coupons out. Remember to check price history if it is available. Best price?
Power Votage: 5V, Sensors: Gravity Sensor / Ambient Light Sensor, Dimension: 218×30 ×150 mm, Processor: Quad-core 1.6GHZ Processor, Audio Input/Output: Microphone / Dual Speaker /4-Band 3.5 mm stereo/standard headsetjack, Power Consumption: 8W, Humidity: <90%, Display: 7.0 Inch Touch Screen With 1024x600 Resolution, Operating System: Android, Power and battery: 4000mAh.3.7V lithium-polymer battery, Memory: 1G RAM /16G Flash
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. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($761.37): BGRepair63
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): BGH8361401, BGAFF10OFF, BGSABAUM26, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGHRepair2, BG10OFFAFF1, BGLIG12
(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 XTOOL EZ400pro Car OBD2 Diagnostic Tool 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)).