SOME NEW PENGUINS
For whatever reason, I've had decent luck in finding some nice Penguin books from what I consider to be their design heyday. It does not hurt that the books themselves interest me and might be useful on upcoming projects! Note especially the awesome cover to the MERITOCRACY book.
On the Greeks:
The best part - for collectors in my area, at least - is that booksellers seem to be swimming in these things, to the point where they sell them for only a dollar or two at most, though often even less.