*cough cough* buy a new cage from Petsmart and keep the box - wash it well, and return at Christmas *cough cough*
I hate to admit but, I would consider that.

I would place a wanted ad on craigslist or freecycle for a cage.
If you check Petsmart, some of the cages are on clearance because they have changed their inventory. Worth checking. They had a Super Pet critter cage (not great but no so bad) with the built in green wheel for $40 down from $70 at the Petsmart near me. It would hold over until Christmas.