The difference can be caused by different currencies: we sell your book everywhere with the currency used in that country. Your book’s price will be converted to other currencies based on current market exchange rates.
The difference can also be caused by the different business models used by each store. You can see the business model used by the store when selecting it. While we send the retails price suggested by you (SRP, suggested retail price) to the stores, they have the right to modify it according to the business models and other factors. Therefore we can’t guarantee the exact match of final prices but we pay you based on the SRP.