Weapon shop
From Dragon Quest Wiki
Weapon shops are where new more powerful weapons are purchased in the Dragon Quest series.
Weapons include swords, spears, knives, staves, axes, and more. Buying better weapons means dealing more damage to foes. Better weapons cost more gold, so money must be saved to buy even better weapons. Each weapon shop tends to carry something different and some even carry armor. Not every character can equip the same weapon, so the player must be careful of what is purchased.
Dragon Quest IV
In Dragon Quest IV, the player can even be a weapon shop clerk as Torneko.