I just (yesterday) bought the exact same thing at local Wally for $15.77/box, they had plenty in stock. I also bought (so far) 180 rounds of American Eagle by Federal .223 FMJ for $7.37/box of 20 in 3 trips. I'll be going back buying my 3 box limit until they're gone.
I've been shooting a lot of .223 lately. I need to build back up to the 1000 round SHTF stash.