Dropped by rock crabs.
Dropped by some Daggonoths.
You can also receive Court summons, granted you have completed King's Ransom and the first Court Case.
Buy from a store for 20 Coins.
High Alch: 30 Coins; Low Alch: 20 Coins.
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For more information about staff roles and responsibilities see this area.
Once you are ready (and signed into the forums), you can find open applications on the navigation bar at the top of the forums.