扼錢、掠水 rip-off

(名詞) 

e.g. $ 100 for a cup of coffee? That's a rip-off.

References:

"something that is not worth what you pay for it" Cambridge Dictionary

"something that is more expensive than it should be: Our meal in town was a complete rip-off.
rip-off prices" Macmillan Dictionary

"A fraud or swindle, especially something that is grossly overpriced: designer label clothes are just expensive rip-offs" Lexico