I lost access to one of my Amazon accounts, and it isn’t easy to recover. They give you the option to make a paid international call to recover your account, since I don’t live in the United States. Can’t possibly recommend it. If you lose your account, you lose all the books you bought.

I think kobo identifies your Wi-fi network, but ever since I found out amazon puts you through this, the book buying (actually renting) lost its charm to me.

I would go with whats available freely on the Internet. I use “filetype:pdf” on Google to find books, for example.