The newer ammo is expensive because people are dumb.

Antlion arrows... 20k per stack or 200k per 12 quivers

Using the above, ill break it down for you:

- arrowheads are made by 85+ bone using 1 antlion jaw (easily farmed in attowah or abyssea attowah) and arent really put up on the ah bc they sell for 2k, then you need bone chips and wind crystals. Pretty cheap synth so far

- arrowwood lumber... Buy them for like 500gil/stack from the woodworkers guild in north sandy

- colobri fletchings... Can buy the feathers or just go stand near a colobri party in abyssea for 5 minutes and mooch their drops, the synth is like level 55 cloth, and uses 2 colobri feathers and a wind crystal,

With that being laid out, you can have a level 85+ wood worker sit in your party and lv 45+ synergist craft them. Nq synth is 1 full stack everytime with no lost materials, only fewell. The hq2 is 2 stacks and hq3 is 3 stacks, and they hq pretty often. I can literally make 12 quivers, mats and all for less than 30k... fewell included.