DontDrop

This plugin gives you the ability to lock your items with a simple command and includes a fully customizable config! You will need VAULT.

Permissions:
dontdrop.command: Allows you to perform /dontdrop
dontdrop.lock: Allows you to perform /lock
dontdrop.lock.nocost: Allows you to perform /lock with no cost

Commands:
dontdrop:
toggle: Toggles the plugin on or off. Reverts back to enabled every restart
reload: Reloads the plugin's config lock: Locks the item in hand, set price using the config for lock and unlock

Config demo:
locked_tag: '&d&lLOCKED' # The lore shown on an item when they have it locked
lock_cost: 1000000000.0 # Price to lock the item (1B)
unlock_cost: 0.0 # Price to unlock the item (0)
lockable_items: # List of lockable items
- '*' # USE * for all items or DIAMOND_SWORD for just diamond sword
# lockable_items:
# - DIAMOND_SWORD
# - DIAMOND_PICKAXE
unlock_on_death: true # Unlocks the item when they die, to allow for people to get rid of it when sifting through items.
message_prefix: '&8[&a&lEP&8] ' # Prefix for all the messages