glass tanks are rough with keeping their humidity up. It may be worth shopping around online at some tractor or equestrian supply stores online and get a big rubbermaid plastic trough, then you could make a lid for it, big enough space for it to run around, deep enough substrate, etc. They do it a lot for ackies. That would be the only other option I can think of other than waiting. There is not off the shelf tank big enough to house them for close to a year, if you aren't moving until Jan, lets be honest building a cage will be low on the list of priorities because you be unpacking and getting your new home situated. If you go the small cage route you will be kicking yourself a few months down the road. I am not harping to be mean, I am telling you from my own experience, the money wasted, the rushing to get a bigger cage, the health of the animal, all things that I constantly kick myself for.
Link for some troughs and stock tanks. http://www.tractorsupply.com/en/stor...ch/stock-tanks