Aliexpress
Click here… to search for Beelink GT-King Pro 4/64GB TV Box on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (181.60 USD): BG589b2e
(CouponsFromChina.com tip: just apply this code 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): 502C6B, elec, BGBFAFF2019, BGCITYADS2019, bGhOnEy10, BGGTKP06, 7bcdf9, BGHALLOWEEN, BGBLGKP11, BGBLKP11YB, BG217991, BGJPGTK03, BGb2b9a4, BGJPBGTP, BGJPMNBGTKP, BG610e91, BGJPBGTK, BGJP8MFF, BGJP99TVC, BG807971, 2022ACTIESNL, BG6fd960, Tabby20, 2203ActiesNL, BG1efeb0, BG467191, BG8OFFCOUPON, TTBLACK5, JanBGCoupon8, BGSaleFeb8, BGSaleAD
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Beelink GT-King Pro 4/64GB TV Box.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).