Joreth

When you click to view an item, it will show you a summary and give you the option to "buy" the item.  You can safely click "buy" with no obligation to purchase.  The "buy" button will take you to the item's official page and it will open it in a new tab or window.  If you choose to purchase then, you can come back to the summary page and select "yes I bought" or "no I didn't buy" to prevent other people from buying duplicates.