I just had a crate of these delivered today, to add to my stockpile. 2 more crates on the way, for next week:
http://ammoman.com/p/60/lake-city-556-55-grain-tracers
Plus, Bushy 30 x 40rnd and 20 x 30rnd mags:
http://www.bushmaster.com/products.asp?cat=9
Huh? What do you want so many tracers for?