I guess you can ask Steve Godshall (in case this doesn't ring a bell he designs and builds all the Meiser lines). He is the only place/person I personally know of that supplies tips made of those materials but as far as I know not bulk rolls like you are looking for. Might be a little like asking KFC for the "secret recipe".
If I had to guess the reason you can't find it it would be that "civilians" can't buy the stuff. Or maybe you need to buy more like half a mile at a time.
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