The last new book I bought was Pat Conroy's latest novel, South of Broad, early this month. Haven't read it yet; I'm waiting for a long weekend.
The last book I bought, period, was last week; the book was The Mind's Eye by Douglas Hofstadter. It's compilation of essays about metaphysics published in, I think, 1985. I've been rereading random essays over the past few days, as I read it back when it was new. I just wanted my own copy.