Usage patterns
法外な値段をふっかけるto charge someone an outrageously high price
They charged me an outrageous price, thinking I was a tourist.
法外な要求をするto make an unreasonable demand
The other party in the negotiation made an outrageous demand.
法外な金額を請求されるto be billed an exorbitant amount
I was billed an exorbitant amount for the repair.