Basically copy coupon, view price history or create e-mail price alert. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Longer LK5 Pro Upgraded 3D Printer 90% Pre-Assembled Large Area with dual blower kit 4.3inch Color Touchscreen | $557.40 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Filament Detector Yes, Gross Weight 13.5KGS, Resume Printing Yes, Printer Dimension 580*540*663mm, Printing Speed ≦180mm/s (Suggest 60-80mm/s), Net Weight 12KGS, Printing Technology FDM, Connection TF Card or USB Cable, Extruder Single, Nozzle Diameter 0.4mm, Layer 0.1-0.4mm, Slice Software Cura / Reptier-Host, Printing Temperature 190-250℃, Package Dimension 662*588*193mm, Printing Material 1.75mm PLA/ABS/Wood, File Format G-code / stl, Printed Size 300*300*400mm (11.8″*11.8″*9.8″), MODEL LK5 PRO
Banggood
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it?
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!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG6b183d, 13f142, BG6eec7e, BG807222
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for LONGER LK5 PRO FDM 3D Printer Kit 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)).