minccino pretty much hit it there. They are expensive, but they are designed to last. A chin can live 10-20 years depending on a number of factors, you need a cage that can hold up. And the FN should last even longer. It is well worth it, both financially long term, and health wise and happiness of the chin. - And small cages with all that plastic can be highly dangerous for chins.
Two things i will point out tho, FN are indeed expensive, but don't forget the cost of things in the cage you may want/need. Bass pans if needed (FN comes with plastic trays) Ledges (fairly cheap, but the ladders are very dangerous), Hut, wheel, etc. It can add up.
Second; and this might be easier, try and find a used cage. Ppl that don't have a need for there FN any more often sell them at a discounted rate. I don't know how it is in Canada, but down here we can often find used ones on Craigslist or something. If you can get one cheaper, then great. Just make sure its in decent condition, and make sure you thoroughly clean it with vinegar/water before using it.