Correct Lehigh can not sell them any longer, they are working under a contract with Knight. So on the Knight site they are listed as Bloodline bullets...

http://www.knightrifles.com/bloodline-bullets/

Price includes the sabots...

Did you make a decision on what you might like to try? If you are interested in the 458's do you have any sabots on hand? If not I can send you a few to see if you can get them through the bore.