I hardly use FAX service but if you use it frequently this post may help you. Yesterday I found a website with which you can send free FAX through Internet and all for free.
Limitations : FAX can only be received in USA or CANADA but can be sent from anywhere in the world.
About FAxZero : FaxZero lets you send a fax to any fax machine in the United States (including Puerto Rico) or Canada for free. You don't need a fax machine yourself, but you do need a valid e-mail address.
Visit and enjoy : http://faxzero.com
For more info click here