You are correct.
We have many affiliates/resellers in the world, and it depends on your time zone and the time you make payment. The payment receivers (especial Paypal accounts) maybe are different.
In addition, each affiliate/reseller has a different discount, so we display the best price for you for that time.
But do not worry, all payment receiver belongs to the same support and billing team. So they can help you in any case, anywhere (worldwide).
To make the purchase, please visit this article. Activate a license.