In Australia, fax-to-email and email-to-fax services are provided by VSPs (voip), ISPs (broadband) and specialist providers.
When using my VSP, my fax sending cost is usually 10 cents per call. Receiving faxes is free, but you pay for a DID.
When using my ISP, my fax sending cost is 3 cents per fax (to 10 pages). Receiving faxes is free, but you pay for a DID.
When using my specialist provider (utbox.net), my fax sending cost 15 cents per page and my fax receiving cost is 5 cents per page. (The DID is covered by a minimum annual usage charge).
All services send locally (Australia) and internationally.
All costs are in Australian dollars.
These fax services have evolved quickly over the last 3 years (use of asterisk?).
Prior to that, I was paying a specialist provider over $25 per month before their usage charges!
As my usage has dwindled in recent years (I am now semi-retired), I now only use my ISP's fax service.
As an aside, all of the above also provide SMS services using both web and desktop applications.