詐欺

If the price is too high we can say it is a rip-off.
Seiji: "Curry & rice is 1600 yen at the ski resort."
Kenta: "What a rip-off!"

Miku: "That pub charges 950 yen for cassis-orange."
Saori: "That's such a rip-off!"

We can also use rip off as a verb.
Mikiko: "My rent is 89,000 yen a month for an old 1K apartment in Machida."
Kazu: "You're being ripped off. You should move out."

Hanako: "Don't go to that hair salon; I had only a trim but it cost 12,000 yen."
Yuki: "Wow! You were ripped off."

Note: rip-off (noun) needs a hyphen; rip off (verb) doesn't need a hyphen

Sometimes we say extortion which can mean the same as rip-off.