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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 (559.99 USD): BGVY702
Coupon (579.99 USD): Wholesale20
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): 1B2GVO26, 19BGVOYO, 19BG26VO, TECH8%, 19BGVO311, 19BGVO325, 19BGVO401, 19BGVO5, BGVO702
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for VOYO i7 8GB 1TB Notebook.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).