Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (477.48 USD): BG8OFFCOUPON
Coupon (477.48 USD): TTBLACK5
Coupon (487.86 USD): BG00c906
(CouponsFromChina.com tip: apply it 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): Cuponation9, COUPONSDE1wk, BgGoodie9, BG051fb5, BGGutscheine
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for Creality 3D CV-30 10W Laser Engraving Machine.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).