Don't know what the shipping is, but before shipping it's .37 per round for 55 gr:

 

http://www.weaponsworld.com/ammunition/rifle-ammo/223-remington-5-56mm-ammo/cbc-m193-5-56mm-nato-55-grain-fmj-ammo-case-of-500-rounds.html

 

and .38 per round for 62 gr.

 

http://www.weaponsworld.com/ammunition/rifle-ammo/223-remington-5-56mm-ammo/cbc-5-56mm-nato-62-grain-fmj-ammo-case-of-500-rounds.html

Never knew magtech (cbc) made 5.56 ammo. Seems like a good price. Thanks for the heads up

Midsouth has Federal XM193 for $7.60 a box. That's 38 cents per.+

PSA still has some Federal XM193 120 rounds for 45.99.