I agree, absolutely you can. Now, I am not in the same class with some of the heavy hitters here, but I've picked up numerous nice, although common, books from board members like October in recent months.You can accumulate a very nice collection of raw books, they're definitely out there.
As long as you don't need the highest graded copy ( not that there's anything wrong with that:) ) you can find perfectly presentable copies of most books easily, key s and the rare books being an obvious exception, but that goes for any genre.
These books may not knock anyone's socks off but, boy they make me happy!
I'm very pleased with the books I've been finding recently and hope to keep finding them.