Bartering

Bartering is the act of trading one item for another. Some merchants will offer the a bartering option if their favor levels are increased.

Serbule

Give	Receive
Cat Eyeball x1 Antler x1	Strange Dirt
Cat Eyeball x1 Power Potion x1	Power Potion Extreme
Beak x1 Tuft of Fur x1	Aquamarine
"Esoteria" x1	Ancient Gold Coin
Boletus Mushroom x1	Weak Poisoned Knife
Field Mushroom x1	Modest Poisoned Knife
Boletus Mushroom x1 Field Mushroom x1	Dangerous Poisoned Knife

Zeratak will offer gear of level 10 and random rarity^{needs confirmation} in exchange for a combination of Brains and Brain Bug Lobes:

Give	Receive
Brain Bug Lobe x3 Brain x2	Basic Boots
	Basic Pants
	Basic Breastplate
	Basic Gloves
	Basic Helm
	Basic Shield
	Basic Sword
	Basic Staff
	Basic Bow
	Basic Brass Knuckles
	Basic Hammer
Brain Bug Lobe x4 Brain x3	Necromancer's Training Staff
	Amulet of Unarmed Fighting
	Amulet of Max Armor +10
	Amulet of Cold Mitigation 1
	Ring of Booming

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Gretchen's offers also include trades of various equipment (of level 20 and Rare rarity) for 3 Matted Hair and 2 Oak Wood.

Give	Receive
Matted Hair x3 Oak Wood x2	Sturdy Boots
	Sturdy Pants
	Sturdy Shirt
	Sturdy Gloves
	Sturdy Helm
	Sturdy Shield
	Sturdy Sword
	Sturdy Staff
	Dwarven Hammer
	Acid Beaker
	Amulet of Competent Swording
	Amulet of Max Health +15
	Ring of Arrows
	Ring of Kicking Ass

At [Comfortable], Helena will offer to barter gear (of level 30 and random rarity^{needs confirmation}) with you in exchange for Giant Mantis Claws and Large Dinosaur Scales:

Give	Receive
Giant Mantis Claw x2 Large Dinosaur Scale x1	Quality Boots
	Quality Pants
	Quality Breastplate
	Quality Gloves
	Quality Helm
	Quality Sword
	Quality Staff
	Quality Cestus
	Quality Claw
	Hunting Bow
	Battle Hammer