A fool and his money are soon parted

A golden key can open any door

A king's ransom

A penny for your thoughts

An arm and a leg

Another day, another dollar

As nice as ninepence

As queer as a nine bob note

Bad money drives out good

Bet your bottom dollar

Cash on the nail

Cheap at half the price

Cut off without a penny

Dead cat bounce

Dock one's pay

Dollars to doughnuts

Filthy rich

Fools' gold

Good money after bad

Guinea pig

In for a penny, in for a pound

In the red

A - king's ransom

More bang for your buck

Not worth a plugged nickel

Overpaid, oversexed, and over here

Pennies from heaven

Penny dreadful

Petty cash

Pin money

Plugged nickel

Scot free

Silver bullet

Slush fund

Spend a penny

Stinking rich

Take the gilt off the gingerbread

The penny drops

Throw good money after bad

Two cents worth

Whip round

Your money or your life