What's the idiom?
throwing money down the drain
What's the idiom?
shall we go DUTCH?
What's the idiom?
(I'm) in the red
What's the idiom?
try not to break the bank
What's the idiom?
must have cost a fortune
What's the idiom?
on a shoelace string
What's the idiom?
we're going to make a killing
What's the idiom?
money doesn't grow on tress