Piggy Bank

When you use it you usually get a Platinum Coin (piggy bank plays Yellow Musical Notes), but be careful; it can turn into a Broken Piggy Bank (while Sparking), even on the first try, at the same time leaving you a Gold Coin (and rarely, 5 Gold Coins). The statistics show that piggy banks have a 20% break rate. This suggests the average value for a piggy bank is 401 gp.

See also: Piggy Bank/Statistics

Reward from the Arena, Greenhorn level.
Reward from The New Frontier Quest.
It can be obtained through Suspicious Surprise Bags, Belongings of a Deceased and Unrealized Dreams.
After breaking 50 Piggy Banks you will receive the achievement Allowance Collector.

Although this item was implemented in Summer Update 2004, it became obtainable only after Summer Update 2006 when it was added to creatures loot.