In no particular order:
Leaded Elemental Vial
Snowbunny Stamp
Candychan Stamp
Ummagine Stamp
Island Acara Stamp
Kelpbeards Trident
Ghostkerbomb
Magical Marbles of Mystery
Holographic Virtupets Stamp
Kacheek Flour
Sword of Lameness
Sword of Skardsen
Sword of Reif
Sword of Tawre
Sword of Thigl
ARGH!!!! Donna Stamp
One Hundred Million Neopoint Stamp
Crisp Blue Tunic
Bent Fork
Hubrids Puzzle Box
Twin Faerie Blades
Meowclops
Freezing Potion
Most of the items have deflated due to duping, but they're still reasonably easy to sell (probably easier to buy ).