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Phrase(s): A thing you don’t want is dear at any price.
Prov. You should not buy something just because it is cheap. • Jill: There’s a sale on black-and-white film; we should get some. Jane: We never use black-and-white film. Jill: But it’s so cheap. Jane: A thing you don’t want is dear at any price.
McGrawhill's American Idioms And Phrasal Verbs