Do you want a fax number located in a different country and receive the faxes directly to your email inbox?
If so you should sign up with eFax if all you want to do is receive faxes this way then you can sign up for their most basic package and it wont cost you a thing.
If you want more features like the ability to send faxes via email or to have the fax number local to where you are then you can opt for one of their paid packages.