Harvest crabs with a chainsaw, pick or your mount.

Harvest hives on Crystal Isles with a doed, pick or chainsaw.

Penguins with a club or mount.

Harvest the dead dolphins on the beaches of Val.

Harvest the white glowing plants on ab (blue and rad zones) with a bear or megapithicus.

Converting organic poly to reg poly by demo'n prefab building items works too, but you will have to take a hit on the rest of the crafting materials. (only get half rss back)

Gachas crystals and pop when needed.

Grind riot gear or fabricated type weapons in an industrial grinder when ya need some as well.