They are (or were) printed on a semesterly basis by an external publisher, so there is (or was) no point in maintaining a continual supply, particularly when the notes may change from semester to semester. You may even need to supply a student card in order to purchase the notes, too.
I know that that seems a little blunt, but can't you just wait? If not, I'm sure that there are forum members who may be willing to sell you their notes.
Edit: I'm sorry, but just enjoy the break. There's no need to try and be ahead of the pack.