That's not half bad. I need more ammo more than mags right now, or I'd jump on that.
If you are interested in bulk ammo for plinking or SHTF, and already have powder and primers, generic 55 FMJ bullets can be found for 8 or 9 cents.
It's the primers that are still the bottleneck, if you don't already have some. Powder and 223 brass are expensive but can be found with some patient digging. Primers are no bueno.