Whoa whoa, what lute girl?! D:
As Vometia mentioned, the girl on the way to paladins camp from town (past the hanging area). She can be persuaded to start selling crap ton of arrow and legendaries/divine bow/crossbow every time she restocks.
Go past her to the paladins camp and the one sitting around will sell you warfare weapon.
The one you rescued from the hanging as part of the main quest will sell accessories.
Tarquin will sell a bunch of stuffs.
Fletcher you can rescue from the top part of the map will sell bow and arrows as well before turning into generic gear npc.
The npc at messed up caravan area to the top right of the map, past the lumbermill/paradise down also sell a crap ton of gears, mainly accessories.
Uncle Thrasher (Tavern) is for Fin gear.
The merchant in the inn at the top floor sells a bunch of stuff.
The male human merchant in the center of the town sells a bunch of stuff. (The only one that really mattered)
There really are too many of them but the guy in the middle of the town + Thrasher + Lute girl + Paladins already cover all your warfare and ranger weapon + all kind of armor issue. The rest of the npcs just make it easy to restock everything every level up.
