I have several that were clean when stored. They're 30x18x18, but modified by a friend who (if I remember correctly) took the bottom grate out and added a hinge so the plastic bottom could be slid out for cleaning. They're secured in groups of 3 or 4, I believe.
I also have several of the standard 30x18x18 (all white) as well as 2 or 3 stands. All are well-used, and are available as is (which means they'll all need a really good soak and cleaning, which means they are dirty
).I also have a stack of plastic cage bottoms somewhere.
If you are interested in any of the above let me know!