"Flexitarian"

I never had a name for my eating habits. But now I do, thanks to Gary Jones at Muck & Mystery. I guess I'm a flexitarian.

He's a big fan of grass-fed beef for both health and environmental reasons. I wonder what premium you pay over regular old grain-fed beef. and whether you can buy it at a regular supermarket. Or do you have to go to Whole Foods?

And, can you get grass-fed hamburger too?