Dual Fans Design, more safety and avoid installation error, With Auto Leveling, With Upgraded Mainboard Box, With 400*400*400mm Large Printing Size, With Dual Nozzle Fan, super heat dissipation, With Upgraded Pully, With 3.5 Inch Touch Screen, Upgraded Stepper Motor and belt, more stable and long service life, high accuracy to provide better printing quality, With Filament Runout Detection, With Bowden Extruder, low noise stable movement.
Basically copy coupon, view price history or create e-mail price alert. 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. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): Wholesale20, bGpAnDacHeCk, Email5, BGX5SA400, 7d18f7, BG3DP09B, BGX400, 13f142, BG78eb57, BG20a9e0, BG807222
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for TRONXY X5SA-400 DIY 3D Printer Kit. The lowest price was: $389.
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)).