There are a lot of freely available books out there. Check out The Creative Commons list at http://wiki.creativecommons.org/Books
O’Reilly has some good free technical ebooks http://oreilly.com/openbook/
For contemporary fiction, I highly rate Cory Doctorow – all of his books are freely – and legally – available from http://manybooks.net/authors/doctorow.html
Finally, the Internet Archive has a huge collection – http://www.archive.org/details/texts
Other than that, I suggest looking at all the different eBook shops out there. If the exchange rate is good, there’s nothing stopping you buying from abroad. You won’t even have to wait for delivery!