Went to Walmart tonight looking for something else and found 5.56 ammo. This is Federal, 420 rounds in an ammo can. $196 per can. That's about .47/round. This is the same stuff that guys on AKlist are selling for $300+ a can.
Bought 840 rounds for $392, was told 1)there's no limit on buying 2)all the Walmarts have ammo and 3)there's pallets full of the stuff. Don't know how good the above info is, but I know I bought some.