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Z's Villagers Part 1
From the Redstone Engineer, you can buy almost any redstone blocks/items.
From the Desert Traveler, you can buy things like Sandstone and many other desert-related items.
From the End Host, you can buy things like Ender Pearls and End Rods.
From the Jungle Traveler, you can buy things like Bamboo and Arrows.
From the Nether Wanderer, you can buy things like Gold Nuggets and Netherite Scrap
Z's Villagers Part 2
From the Thief, you can buy all sorts of Ores but they're on the pricey side
From the Coastal Traveler, you can buy things like Tropical Fish and Pufferfish
From the Sculk Valiant, you can buy things like Soul Torches and Saddles
From the Tree Lover, you can buy things like Tree Saplings and Torches
From the Combat Assistant, you can buy things like Weapons and Shields

More Villager types will be added in later versions