Quality cages makes really nice chinchilla cages at a pretty reasonable price. Check out
http://www.qualitycage.com/chinchilla.html
You could also do a search in the chin section for "melamine" and see some of the home built cages our members have. Those are pretty inexpensive to make if you are handy with tools.
With chinchillas, the bigger the better. They love to jump up on ledges and platforms. However, if you have a cage that is more than 3 feet tall, you will want a solid floor in the middle so as to avoid falls from too high if chinnie loses its footing. Also, you should go for solid floors over wire ones as wire can cause foot problems.
Hope this helps
