Laser output power 5W-5.5W, Wave Length 445 ± 5nm, Item model number ATOMSTACK A5 PRO, Laser power 40W, Output Voltage DC12V / 5A, Engraving accuracy 0.01mm, Package weight 5.2kg, Equipment net weight 4.0kg, Print Size Recommend Print Size 410*400mm, Equipment size 570*600*270mm.
Basically copy coupon, view price history or create e-mail price alert. What is best price?
Aliexpress
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Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($340.39): TTBLACK5
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): BGHONEY2110, BGESPRO, BGLaserEq1, BGf71b5f, BGATOPR, BG9aadc5, BG56e846, BG2e21c8, BG9eda6b, BGU82886, BGANI002, BG05dda3, BGde9a9d, BG5007d9, BGU82888, BG8e24b5, BGb46ffa, 00c906, BGb4c457, BGb74847, BG84b454, BGbdcf25, BG09dceb, BG07d062, BGbd7ca0, BG364677, BGd6d779, BG85c0d4, BGA5PRO2, BG0a3315, BG4fcf1f, BG6d2676, BGfdb82b, BG27dd80, BG78fbb2, BG0138bc, BGf8fcfe, BG9090d9, MVC8SPRING, BG17b95c, BGb1bd6e, BG0683b0, BG3f6b1c, BG185230, BG4f0e2b, BG234faa, BGd93c39, BGfd0a92, BGROTTERZ1, BGa1cc72, BGf089f7, BGdfab5d, BGb58e3a, BGed7be6, BGc9382c, BGd1c881, BG6a3cdb, BGadd92e, BGae21dd, BG9358e7, BG529f39, BG5316c5, BGDEITFRPL28, BGdc3eb5, BGf0f4cc, BGc84def, BG2c42ed, BG3ac3ce, BG831838
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for ATOMSTACK A5 PRO Laser Engraving Machine. The lowest price was: $219.99.
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)).