Here's some examples of traders
Baker: Cakes, Pastries, Chocolate, Flour and Eggs
Winary: Jug, Grapes, Wine
Tea Stall: Tea, Tea leaves, Kettle, Teapot, Teacup, Sugar
Normal Gem Stall: Jade, Opal, Quartz, Rose Quartz, Saphire, Emerald, Ruby, Diamond
Seed Stall: Sells all seeds^
Gardening supplies: Spades, Trowles, Seed Dibbers, Plant Cure, Scarecrow and Scarecrow materials, Compost, Buckets.
Swords: All metal*^ Shortswords, Longswords, Scimitars, Great swords, Daggers and Rapiers (only some sword stores have rapiers)
Axes: All metal *^ Battle axes, Throwing axes and Hatchets.
Herbary: All herbs ^
Exotic foods: Cheese, Curry Leaves, Banana, Some Whales and even more foods...
Toys: Toy Horsies, Kites, Juggle balls, Clockwork toys, Fun Weapons, Little Flags of empires
Armour: All metals*^ Plate Bodies and Legs, Light, Med and Full Helms, Gauntlets, Boots, Chainmail, Square Shields, Kite Shields, Round Shields, Impaler Shields.
Maces: All metals *^ Maces, Mauls, Throwing hammers and Warhammers.
Ranged Weapons: Bows of all woods^ (apart from Shogun and Magykal), Arrows of all metals *^, Throwing Daggers, Axes, Disks and Hammers of all metals*^, Javelins of all metals*^.
Fruits: Apples, Bananas, Tomatoes, Berries of all kinds^, Oranges and Mangoes.
There are lots more to be made and suggested. If you want one to be suggested, post it here!
* Except Special Metals and Dimonite and Mithril
^ Except Special items