Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (32.55 USD): BG96af8c
(CouponsFromChina.com tip: apply code in your basket (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): BGc38c90, BGd1030d, 2022ACTIESNL, BGe5ab17, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8BGwbg2204, BGHUB15OFF
(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
Price history (for all/most countries) for ROCKETEK SGO773 Surface GO Hub is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).