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We made http://mailprincess.com/ a while ago which is $1 per fax

You should really get an SSL Cert. They are free these days

It exists, but will only deal with USA numbers = I live in Canada, maybe one day ....?

These exist! They're not cheap and probably ripe for disruption.

Disrupting fax over internet? Why not just disrupt fax?

More seriously though, the organizations still using faxes are not interested in "disruption", or anything else that is newer than the 80s.

The Twilio API supports fax, so I used it to make this: https://5dollarfax.com/

Cheapest service I know of if you infrequently need to send a fax and wait a few days for the possible reply.

They exist and cost $10 for a couple of pages, as the OP said.