If you need to send a FAX and you don't have a FAX machine, or you are just cheap, TPC is a company that offers a free FAX service. There are two options for sending a FAX. In the first, you go there site and enter all of the information in a form. In the second, you send an email with a special TO address (http://www.tpc.int/faq/basicsending.html has all the details) and the FAX gets sent.

If you are looking for a way to send a FAX cheaply, you can't get much cheaper than these guys. You can even get a report to make sure you FAX went through.