Built-in Lithium Battery: 4000mAh, Power and Battery: 4000 mAh lithium-polymer battery, Ambient: -20℃ ~ 70℃ (storage); -10℃ ~ 50℃ (working), Operating System: Android 7.0, Display: 5 inch IPS touch screen, Product Net Weight: 530g, RAM: 1GB, Wi-Fi, Processor: Cortex-A5 processor (1.5 GHz), Product Size: 248.7×93.5×36(mm), Connectivity: Mini USB 2.0, ROM: 8GB.
Go down and check coupons out. Remember to check price history if it is available. What is best price?
Aliexpress
I could not find it 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. Well, there is one coupon available right now.
Link: Banggood product page
1. ($314.06): BGRepair63
coupon code has to be applied in shop’s 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): TTxBG10, DVRCAMERA10, BgAuMotor, AM15prime, BGAnniversary, AMPrime01, Automo, BG11X431, BGLAUNCH, Automo1, BGBFCAR01, BGLAUNCH1, BGCHRISTMAS, BG20CAR, BGAutos, bGhOnEy10, BGJulyCAR01, BG219219, BG239239, BGCARELEC, BGAFF10OFF, BGCuponation10, BGwhielabel, BGHRepair2, BG10OFFAFF1
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for LAUNCH X431 CRP429C OBD2 Tool. The lowest price was: $205.49.
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)).