Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (136.79 USD): bGhOnEy10
Coupon (136.79 USD): BGdragonBoat
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): Tools3, BGBFCR42, BGCITYADS2019, AFfbG10, BG5784, BG7960, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for NEJE DK-BL Bluetooth 3000mW 450nm Laser Engraver? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).