Cheapest I've seen yet - Federal American Eagle .223 for $5.79/box of 20 (~$0.26 / round) at Cabela's:

 

http://www.cabelas.com/product/American-Eagle174-223-Rem-55gr-FMJ-Ammunition/1161162.uts

 

(I'm sure Maks will be along shortly to change the above into an affiliate referral link)

 

$5 shipping for all orders over $150 with code 2WFLAT

 

Sale lasts "One Week", not sure exactly when it started.

Hmmm $295 shipped for 50 boxes. What do you guys think? Worth it?

I can't check the shipping price at work due to a web filter, but Wideners has it for $285 before shipping. Check there before ordering.

Pretty nice deal. I would order from Cabelas, they are quick to NJ, and never any issues. Does deal come with the ammo box?

Thank you Jon will def chk it out when I'm back from CT tommorow. I'm almost done with my AR build so it's time to get some ammo

Maks I don't think so. If you really want one >>> classic arms have a deal on ammo and ammo boxes.