Vendors (also known as dealers, merchants or traders) can be found across Vardoran selling a wide variety of Items in exchange for specific currencies. You need to be in 
Human Form or 
Grandma Form to interact with some vendors. In earlier versions of V Rising, damage from Silver Exposure would break the disguise, making it difficult to trade. This is no longer the case.
Excluding Treasure Hunter and Vampire Merchants, there are four main types of vendors in each region (Farbane Woods, Dunley Farmlands, Silverlight Hills):
Treasure Hunter is a special vendor in Gloomrot North who sells Sanguine Weapon blueprints, unique tier 3 Cloaks, and high end main vendor items.
Vampire Merchants are special vendors in Ruins of Mortium who sell 
Rare Weapon Shards and 
Epic Weapon Shards.
Vendors sell fixed quantities of items, varying by category. They will refresh their stock of items every 55 mins. For some categories, all variations are always purchaseable, while for others, only a partial selection are offered, chosen randomly each refresh. (for example: if the vendor sells three different weapons, he will refresh his stock with a new random selection of three weapons).
All vendors only accept one currency at their store. The currency used by the main vendors depends on the location of their store:
Farbane Woods
Shady Book Dealer
The Shady Book Dealer always sells 15 total different recipes that can be unlocked at a

Research Desk.
Shady Herb & Potion Dealer
The Shady Herb & Potion Dealer always sells a total of 6 different herb seeds and potions. Note that every seed is from flowers that can be found around
Farbane Woods and the brews can have their recipes unlock at the

Research Desk.
Shady Goods Dealer
The Shady Goods Dealer always sells 8 different items that includes important
fishes and resources from
Farbane Woods &
Hallowed Mountains. Note that there are unique equipments that can not be crafted such as the head armours and the weapons. They can only be found in this merchant or be rarely dropped.
Dunley Farmlands
Rural Book Merchant
The Rural Book Merchant always sells a total 13 of different recipes (each of them with specific stock) to be unlocked at the

Study.
Rural Herb & Potion Merchant
The Rural Herb & Potion Merchant always sells a total of 6 different herb seeds and consumables. Note that every seed is from flowers that can be found around
Dunley Farmlands and the brews & potions can also have their recipes unlocked at a

Research Desk,

Study or by
V Bloods.
Rural Goods Merchant
The Rural Goods Merchant always sells 8 different items that includes important
fishes and resources from the
Dunley Farmlands. Note that there are unique equipments that can not be crafted as the head armours. They can only be found in this merchant or be rarely dropped.
Silverlight Hills
City Book Vendor
The City Book Vendor always sells a total 10 of different recipes (each of them with specified stock) to be unlocked at the

Athenaeum.
City Goods Vendor
The City Goods Vendor always sells 8 different items that includes important
fishes and resources from
Cursed Forest and
Silverlight Hills. Note that there are unique equipments that can not be crafted such as the head armours. They can only be found in this merchant or be rarely dropped.
Gloomrot North
Treasure Hunter Trade Post
The Treasure Hunter Trade Post only has one vendor, who accepts

Goldsun Coins as currency. The Treasure Hunter can be found in his
solitary cabin located in
Gloomrot North.
You don't need to be in
Human Form to trade with this vendor.
Trivia