30" by 30" is an odd measurement for a bird cage. I searched as well for a cage of this size with no success. It depends on what type of bird you are going to have, i'm guessing that you wan't a cage for Apollo. For a medium sized bird i would recommend a flight cage as they have heaps of room for the bird to exercise in (i will leave a link). Anyway i hope you find the right cage soon, good luck.