(Since the picture doesn't really show it's size, the top measures 9½ x 13½.)
Admittedly, most of Goodwill's basket selection is quite picked over. I'm talking gift baskets with handles that don't fold down & lots of round baskets. I think I do have one round basket in my house, but overall they're kind of a waste of space. Rectangular baskets make much more efficient use of shelf space. And every once in awhile, you may come across a rectangular basket in decent condition while perusing a thrift store! So don't forget to look next time you're there, just in case!