I was looking for some sort of coupon and remembered that I had once seen an advertisement on Aliexpress itself.
Here's how to use it: www.aliexpress.com/activities/mastercard/coupon/saturdaysaving/how_can_i_save/index.html.
It only worked for me after I first placed the order,
and only then selected it in the list of orders and clicked Pay.
Can be used with other coupons,
but they must be entered before placing the order.
Go to the store