Whenever this question comes up I see myanonamouse recommended as a private tracker.
I just wanted to throw in that there is also a tracker called abtorrents which hosts audiobooks and ebooks, though I believe most or all of them are english.
I cannot speak as to the selection between those two unfortunately.
Where do you see low bandwidth? Maybe over long distances but if I can give a pigeon a 1TiB USB stick and send it to the next city I bet it will be faster than uploading the data. If it arrives that is