From Sportsman's Outdoor Superstore you can still get Twin Cities M196 TRACER 5.56MM 820 ROUNDS for $349.99. So a little less than $.43 per round is about the best deal I have found for ammo that is still in stock right now. And the best part is it is brass cased so you can save the fired brass to reload or save it and sell it to another reloader like myself on gunbroker!
"No free man shall ever be debarred the use of arms. The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government"
-- Thomas Jefferson, 1 Thomas Jefferson Papers, 334