Brassmanbrass (or something very similar) had once-fired no crimp Remington brass for $75.00 per thousand, shipped. I've had good results with it.
Someone mentioned IMI brass. I'm sure it's good brass, but the small batch I had was very heavy in comparison with other .223 or 5.56 brass, about 10% heavier as I recall. Would probably require a powder charge reduction.
