Here it is from the horses mouth, I contacted Hornady support and this is the answer that I got back, now for a tidbit of history in about 2017 I contacted them and asked the same question and I got back essentially the same answer, so officially they are not discontinued but rather production has been suspended, so finding them may be harder than finding primers
"Ed We have not Discontinued the InterBond line of bullets. However they have been suspended in production several times throughout the last several years as they are a very time consuming bullet to produce. We anticipate that at some time we will be able to bring these back on line for full production at some point when we get done with the additional production equipment we are bringing on line. Thanks "