I bought a leg of lamb in the supermarket and it cost me a king's ransom.
The painting was sold for a king's ransom.
An emerald of that size, unflawed, would be worth a king's ransom.
I'm not sure where home buyers got the idea that they could buy and flip houses every 24 months and collect a king's ransom's worth of tax-free profits.
In mid-March America said it had finished its investigation, but it still hasn't sent the cash (a small sum for most countries; a hermit-king's ransom for North Korea).