Your prices are in line with what I've seen for sale on Gun Broker or cheaper. However, one seller with an unlimited supply was selling his for about $50-$55 each (per 5 or 10 round pack) a couple of years back. He was taking loaded API rounds (silver tip) and repainting the tips green and white like the Raufoss MK211. He figured no one would cut open a bullet to check. He was wrong and he got sued by several buyers. I wish I had a 40 acre field full of these but what money I have always needs to go elsewhere.
https://en.wikipedia.org/wiki/Raufoss_Mk_211