Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (169.99 USD): BGFernando88
Coupon (179.99 USD): BG522df1
Coupon (179.99 USD): BGFernando12
Coupon (272.99 USD): BgGoodie9
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BGb381d2, BG175ffe, 2022ACTIESNL, BGbdcf25, BG1e6b7a, BG4352df, BG3ac284, BGbd83b2, BG637ca5, BG23828f, BG589b2e, BGSaleFeb8, BGd266f5, BG6406a3, BG530ec9
(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 ATOMSTACK P7 M30 Portable Laser Engraving Machine is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).