Federal's 223/556 is now 83 cents per round before tax. 9mm is 54 cents per round, 45 is 68 cents per round.
I've noticed all Federal ammo has been going up on retail sites as well, even the ones who typically have the lowest prices. It's only a matter of time before the big box stores raise their prices unless they just plan on eating the profit loss.
If it's accurate that ammo sales account for a tiny fraction of big box store business, it stands to reason that keeping prices at or near current levels is smart from a marketing perspective. Some of the foot traffic that comparatively lower ammo prices generate probably translates to sales of other merch.