@medusa yeah i know. My friend helped me with it but there wasn't an option to download into my desktop/laptop
@marc nope, i'm from singapore
@mores yeah my itunes account is tied to my local server so no kindle for me here. And yeah i now have to resort to buying from Amazon then syncing with Kindle for PC and then transferring to Calibre. A roundabout way but i guess i have no choice.

Most if not all should be available in the iTunes store.

There's free software out there called Hamster ebook converter. It'll let you drag and drop ebook files from any type, and convert it into another. I tend to transfer all of mine into epub files, since they're mostly cross-platform. Hope this helps