I try not to buy books I consider Poor. However, age comes into it as well. A twenty or thirty year old book I'd class as Good might only be Fair if it were five years old, for instance. I won't buy in anything that's literally falling apart. Even if I say the quality is Poor, it will at least be in one piece, with an intact cover.
All books are paperback, unless otherwise specified.
Asimov, Isaac The Early Asimov, vol. Chalker, Jack L SOLD . Chalker, Jack L SOLD . 223 Fair 2.00 0.85. Hardback, book club edition.