Item ideas
Teleportation Crystal - Let's your party escape in dire situations. Consumable, expensive.
Magic Lamp - Requires 1 mana potion per quest to keep it lit. For exploring dark places.
Traps - Useful for many things, especially for capturing animals. Consumable, price varies.
Sacred Idol/Incense etc - Forces evil beings to be weakened, revealed, etc.
Enchanted Equipment (Weapon, Armor, Shield etc) - price varies but usually more expensive than their non-enchanted parts.