Chuwi store bying process

my name id chris. i come from germany.
i would like to buy a chuwi core book, intel core i5-825 U.
some minutes ago, i tried to buy this type on chuwi store.
i received a 10 dollar coupon, so i could buy this laptop for at least 489 dollar.
in the beginning of the bying process, it was said that i can receive the laptop from spain for 430 euro.
so with the coupon i would receive it for 422 euro.
as i tried to buy it via paypal, chuwi wanted to have 440 euro.
what did i do wrong?
do you have an idea how i can receive the laptop cheaper? best regards