Audiobooks on iBooks
Are audiobooks still a one-time download even after the iOS 8.4 update and move to the iBooks app?
iPad Air 2 Wi-Fi, iOS 8.2
They appear to still be a one-time only download - the iPad's iOS 8.4 says that you can redownload them but that doesn't appear to be true (mine don't show for redownloading on my iPad). Tones are also one-time only downloads.
(Other items are only redownloadable whilst they remain in the store and you don't move countries.)