I needed to do some fax stuff, so I googled for quite a while ... found lots of expensive stuff. Then faxed some other way. Then a friend told me about something that was a good deal, but it would not work both ways. Then I did more research. Then more research. Then found faxaway.com. They seem kinda rinky dink, but the faxes are working. I think you receive faxes for free and it costs peanuts to send faxes.
You give them ten bucks. They take out a buck a month. They take about ten cents a page for faxes sent. Receiving faxes is free.