Most of the materials for things are easy to obtain and still are even after patch. The only things that are hard to obtain that will skyrocket are the demimateria, some big fish, and some garden grown things. But that's about it, you can buy most of the other stuff from NPC beastmen vendors/town vendors. And the stuff not sold by those are easily obtained by a short time of farming. Yea the philo and myth stuff will shoot up in price but ixali quests should have netted a good amount of oaknots since no real 'need' for philo mats unless people were working on books for new tools before patch. Also GC seals aren't too bad to get either doing daily turn ins especially HQ's on the bonus items. So plenty of ways to get materials cheap asides the certain 3 listed since those require your own personal skill or relying on someone else who has the skill/access to obtain it.