Wlamart (love it or hate it...)
I stop by the Wal-mart in Roseville every morning on the way to work looking for 223. Got lucky this morning they had Federal FMJ 55 grain $35/100. I got the only box left, but there was another brand that they had like 10 boxes of $7.95/20.
At least they haven't raised their prices, yet. Now I have at least enough to break-in my barrel when I finish my featureless build. Hopefully, by the time I finish the 3 other builds (for my sons) all this will have blown over.