Any true Hunter-Gatherers left?

Are there any societies left that get all (or at least the vast majority) of their food, clothing and shelter from hunting and gathering? Even supposed “stone age” tribes in the Amazon, sub-Saharan Africa and Borneo: do they actually provide for themselves today solely by utilizing their natural enviroment, or do they get much of their sustenance through trade with agricultural peoples, assistance from modern states, etc?

http://www.ucc.uconn.edu/~epsadm03/kung.html

The Pygmies?

Oh, and:

http://indian-cultures.com/Cultures/yanomamo.html

Some of the tribes living in the Andaman Islands, in the bay of Bengali are still incredibly isolated from the mainstream world.