Different kinds of Orbs could be found in different dungeons with different rarities and bought in Kecleon Shops.
Their prices are $300, except the Beatup Orb and Possess Orb, two Orbs that only appears by Cheating; and the Sandy Orb and Rocky Orb, which prices are $500.
They could be sold for $150. The Sandy Orb and Rocky Orb, however, sells for $250.
The In-game descriptions differ among different Orbs.
Each kind of Orb has different effects.
For the list and uses of each Orb, see List of Wonder Orbs and their uses.