With these services you can also start for free by taking advantage of their trials. However, you should know that there are many web fax services out there that are not even worth trying, as they bring you trouble, lack of support and hidden charges (I once was interested in a service that was $4 per month, but they charged $20 just for setting up the account!)
Here’s an article that will help you to find the “Best Internet Fax Service”.
Here’s a quick excerpt:
“Making the right choice is paramount for your success with Internet fax services. Even though the costs of this new way of faxing are considerably low compared to traditional faxing, it is still bothersome having to switch fax providers because of poor customer support and constant problems.
Fortunately, choosing the best Internet fax service comes down to learning a few things and keeping in mind some tips. Here we will learn more about them.”