How can I get debian linux?

["东集詹" <imdjzhan@gmail.com>]

Hi debian users,I am a new of linux.Some day I found debian linux and know much about this.As I learned, debian linux is the true linux os and there are so many components compress in the disk. I got interested in it. I hope to get 
it.But nothing is easy, when I planed to download it,I found that there is so large to download it, because my disk can surpose such large file. So the only way is to buy it. But that is just another way that cann't be used. Because,linux disk is so little in shoppes. So,the only way is to ask you for help. I love linux,I love debian!