I've ditched faxing entirely. Want to fax me something? Either scan the document or take a picture with your cell phone and e-mail it. All I ever got was faxes for time share and vacation offers. A client is using Metrofax for $8/month, and is happy with it.
Also, check with your phone/cable company. When I had an AT&T land line, incoming faxes were automatically captured as pdf files for approx. $4/month.