Where can I find an Ethernet cable?

I have searched every computer store in a one kilometer radius of my house and NO ONE has an 8 meter Ethernet cable. That means that although I now have my own computer in my room, I don’t have internet access (or a Hard Drive) and so I’m stuck without access to most of files and documents. Not to mention the fact that I can’t download new software and that I have to go to another room whenever I need to use the Internet. Frankly this is getting on my nerves. I’ve told one computer store to get me a cable and they’re supposed to get it tomorrow. However I have my doubts, since they were supposed to get it today and they haven’t got it. But there is always hope!