well, you can ship the cage, but it really depends on what the cage is made of and how big the cage is. I get all of my smaller cages shipped and the shipping is like $9. They are made of plastic and are about the size of a 10 gal glass aquarium. But the larges cages made of plastic start getting more expensive. Cages and racks systems made of melamine are hardly ever shipped due to the weight of the materials and size of the unit. There is one person online that biulds rack systems out of melamine, then disassmebles them for shipping. It still cost a little more, but with a screwdriver you can put the cage together in about 15 minutes.
I wish I could remember the site I saw that on