From Chris King's website -
No matter how hard we try, a certain number of hubshells just aren't going to pass our quality control standards. A bore is a tiny bit off, a wall thickness is little out of the tolerance, maybe the shell's surface finish was not quite right. Into the scrap pile it goes. Unless it would be OK for a shaker.
No MSRP online, but if all of you want to chip in for some sort of summer solstice gift for me, you could probably call them for the price. I like green.