High interest, low vocab, leveled non-fiction.
Jellybeanscoop is a free source of leveled articles. The site contains high interest, low vocab, leveled non-fiction (4 different levels) complete with an audio reading. The articles are suitable for intermediate to middle school students. (There is an option to pay a membership fee in order to get a "study program" with tests, comprehension questions, etc., but that is not necessary to read or hear the articles.) - Thanks DT for the heads-up