RNG sucks!!

[Bun_Vivant]

If you have a retainer leveled up in a combat class they can farm materials from mobs.

This. Using leveled+geared combat retainers on my various alts, I can get over 240 luncheon toad skins in an hour for 16 ventures.
Of course, even quicker is to just buy them off the marketboard, but I rarely do that, and I understand why people might not want to. But if you did some leves (for example) instead of hunting the skins yourself, the leves would probably easily pay for the skins.

Sometimes the round-about path is the fastest.