I went through to Sheffield today, to the always rewarding Oxfam bookshop and picked up five more. Needful Things, Bag of Bones, The Dark Tower I: The Gunslinger, The Dark Tower III - The Wasteland and The Dark Half.
Annoyingly, I hadn't taken my list with me and couldn't remember which four novels constitute the collected Bachman books. As a result, I didn't buy Thinner. I'm a douche.
Anyway, here's the eighteen I have so far...