To buy only have to give the button "Add to Cart" and leave the default shipping normally "Medium", and from there everything is so automatic. I asked looking at the delivery address and you must get the data from your credit card. Keep in mind that if you live in Europe the only valid card or cards will only Visa and MasterCard. Master card, despite being a Mastercard card is NOT valid. Also virtual cards are valid provided they are Visa.
After inputting the data of your card and validate your purchase you send several emails with your order and can be viewed as going shipping. It normally takes a few days to send it and give you some approximate dates (Shipping estimate For These items) and delivery (Delivery estimate). When Amazon sends the goods back to send an email notifying, then it is a matter of the post office (mail, courier companies not) of each country.
If you buy more than one item and one of them does not exist in the place where it is usually send your order separately without extra shipping charge. They do this so that shipping will be much faster because usually sent from where you have it, otherwise all the global shipping delay.
As shipping costs vary from country to country, and an Amazon to another, not the same amount from Amazon.uk (United Kingdom) since Amazon.COM (USA). Since the United States is less than 4 € per item. In this link you can see the shipping normal for Spain, and from this other link shipping costs for Latin America. (This is the link to the rates from the UK to Spain, prices are in Pounds).
