piggy bank
penny bank

I don't think it should be used as a piggy bank for other programs.

And just maybe there'll be some change left for my piggy bank.

There was a piggy bank that my mother kept for me.

Why not pick on something safe like the Church or the judge's piggy bank?

"Medicare is too important to all families to become a piggy bank for just a few."

But he may have to dig deep into his political piggy bank.

He left them with nothing, and even opened Rodney's piggy bank.

He's not running the company like his own personal piggy bank.

We actually keep a piggy bank by our bed now.

Let's not make it a piggy bank for the wealthy.