It's going to be about a dollar a round... because that's what I had to pay for it.
Don't ever get down to one box of SD ammo.
I have Winchester SXZ somewhere. It's much cheaper because I bought it a long time ago.
Holy crap! The machine shop manager at YKK in about 2001 was the one that recommended it... no idea about the place since I never went there. I do trust that guy though (the YKK one, not senior ptsd).