New ideas on the table include possibly eliminating bus transfer passes and charging for parking on Sundays.
It follows action on Friday to eliminate 230 jobs and cut service by 10 percent, just to get Muni through this current fiscal year.
"It's uncountable that a city that claims to care about the environment, that claims to care about urban environmentalism, is decimating Muni service right now," says Dave Snyder from the SF Transit Rides union.
"We're increasingly in a position where we must recognize that we can only deliver the service that we can afford. We must grow our resources or reduce service," says Nathaniel Ford, the Muni executive director.
The latest round of layoffs and service cuts are set to take effect May 1, 2010.