Cowboy,
don worry
a cage or a kennel won't cost u more than an arm i guess
.
If u really don want to cost u too much, u can buy some cheap material and build it urself.
Beli papan won't be too mahal mah. and build it urself. Even Kak iman a forum member can build it by her own.
Or maybe u can visit any petshop and compare the prices.