Aliexpress
Click here… to search for Xiaomi Giiker Supercube i3 Magic Cube on 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 (55.25 USD): tRaDetRaCKeR
Coupon (55.25 USD): 8wEbgaInS5
Coupon (55.25 USD): pROMo8cuPoN
Coupon (55.85 USD): 2203ActiesNL
Coupon (56.45 USD): BG00c906
(CouponsFromChina.com tip: this code has to be applied 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): BGGiiker, BG7521, BGJP7582, bGhOnEy10, BGLab18, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, BGLAB61, BGLab21, BANGGOODSD, 00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, BG1efeb0, MVC8SPRING, 8BGwbg2204
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Giiker Supercube i3 Magic Cube.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).