get off cheap
get off cheap {v. phr.}
1. To receive a lesser punishment than one deserves.
Ted could have been sentenced to fifteen years in prison; he got off cheap by receiving a reduced sentence of five years.
2. To pay less than the normal price.
If you had your car repaired for only $75, you got off cheap.
Contrast: GET AWAY WITH.
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Source: A Dictionary of American Idioms