What I know of:
Graal City (Train Station Shopkeeper)
Graal City (Tailor)
- Dirty Underwear
- Ruined Scarf
MoD Town (Bartender)
Swamp Town (Fisherman)
- Fishing Lure
- Fishing Hook
Master Li's Woods (Stablehand)
York Town (Pirate)
- Gold Doubloon
- Silver Doubloon
- Heavy Anchor
- Ship Helm
Snow Town (Blacksmith)
- Blunt Arrow
- Defused Bomb
- Cracked Shield
- Broken Sword
- Chainless Flail
York Town to Snow Town Rail Connector (Man In Cave):
- Oddly Shaped Gems (doesn't include imperfect pearls, someone please expand on this)
Oasis (Little Kid)
- Seashells (there are lots of seashells, someone please expand on this)
Elster's Cave: Everything