On this page, you can find map locations for important NPCs in Witcher 3, including the master armorer, blacksmith, runewright, and potion of clearance merchant. These guys will make your life a lot easier so it’s helpful to know where they are.
Master Armorer Location

The master Armorer – Yoana – can be found inside Crow’s Perch in central Velen.
Master Blacksmith Location

The Master Blacksmith – Hattori – can be found in southern Novigrad.
Trophy Turn-in Merchant Location

This alchemist, located just outside the Oxenfurt Gate of Novigrad, is one of few NCPs that will buy your monster trophies for decent prices. For example, you can sell an Ekimmara trophy for 500 gold. If you don’t see him, it may because it’s too late in the day, so meditate until it’s day time.
Potion of Clearance Merchant Location

The potion of clearance resets all of your skill points when you use it, allowing you to re-specialize your points however you want. There are several merchants that will sell it to you, but the simplest choice is the herbalist in Novigrad, near the St. Gregory’s Bridge travel post.
Runewright Location

You can find the runewright far north-east of Novigrad, on the eastern shore of a lake in Upper Mill.
Gremist Location

You can also buy a potion of clearance from Gremist, a druid located on Ard Skellige (after you finish his questline). He’s found close to Gedyneith, the sacred oak tree of Skellige’s druids.
You may also be able to buy the potion from another merchant close to Gremist, although I haven’t been able to get him to show up yet.
Keira Metz Location

You can also buy the clearance potion from Keira Metz while she is still in her hut in Velen (before you continue her questline).
Beauclair Dye Merchant Location

If you want to color your Witcher gear in different shades, your best bet is to buy dyes from the merchant in Beauclair, who is located near the Beauclair Port travel post.
Zerrikanian Saddlebags Location

Zerrikanian Saddlebags are the best pre-expansion saddlebags (Beauclair saddlebags from Blood & Wine are slightly better) and will increase your maximum weight capacity from 60 to 160 which is very helpful if you’re always looting everything you see.
You can either purchase them for 900 gold from a merchant in Novigrad’s Putrid Grove or get them for free from a horse race on the main Skellige Island.

Triss Merigold’s House Location

Here’s the location of Triss Merigold’s house in Novigrad. Good to know if you’re trying to romance her.
Grandmaster Smith (Blood and Wine Expansion) Location

Grandmaster Smith Lazare Lafargue starts the Scavenger quests for the Grandmaster tier of the Wolf, Griffin, Cat, and Bear witcher sets, as well as the brand new Manticore set, and is also the only smith who can craft them.
In addition, he also sells the best saddlebags in the game: Beauclair saddlebags (+110 inventory weight, 10 more than Zerrikanian).
Beauclair Saddlebags Location

The Beauclair saddlebags are the best in Witcher 3. You can also get them for free from a chest at this location after helping the Knight Errant.
If you guys have any other suggestions for important NCPs, please let me know in the comments.

I’ve been playing PC games since the late 1990s and have always enjoyed RPGs the most (Dragon Age, Mass Effect, Elder Scrolls, WoW, Dark Souls, etc.). I had tons of fun playing Witcher 3 so I made this website for discussion, guides, and other info related to the Witcher game, books, and cinematic universe. Hopefully, you find something useful or interesting!
The alchemist outside of Novigrad put a price of 33 crowns for my ekimmara trophy, why is that ?