But it's $13 shipping for me...I added 2 more and it was still $13 shipping...
http://www.primaryarms.com/millett-one-piece-cantilever-red-dot-mount-30mm-ring-and-1-insert-dt00030
http://www.primaryarms.com/millett-one-piece-cantilever-red-dot-mount-30mm-ring-and-1-insert-dt00030