I just recently hit 50 on a couple of my FFXIV crafting classes · 7:11am Jul 7th, 2016
99% of craft mats up to around level 20 in all crafts can be purchased, quite cheaply, from NPCs. The one exception that immediately springs to mind for me is Aldgoat Skin. If you have retainers unlocked then you can try selling the other items on the MB. If they seem fairly worthless, which many of them are, then vendor them. You don't need those Animal Skins or Animal Hides because you can buy Leather and Hard Leather from an NPC for probably less than the value of the shard it takes to make