Q&A: Where can I find Incroquat CR? And finding replacements for ingredients I use

In this month’s Q&A, Dalel Djegham asked, I’m looking for Incroquat CR to make a solid conditionner. I can’t find it easily. Here what I found: Purple Citrus, Saffire Blue, The Herbarie, CoChem (sample), Croda (sample), somewhere I found Quatrex CRC (by Chemron Corp). (Is it even the same thing?) So my questions are: where do I…