not cost a penny

:  the amount or equivalent paid or charged for something :  price

:  the outlay or expenditure (as of effort or sacrifice) made to achieve an object

:  loss or penalty incurred especially in gaining something

:  to require expenditure or payment

:  to require effort, suffering, or loss

:  to have a price of

:  a monetary unit of the United Kingdom formerly equal to ¹⁄₂₄₀ pound but now equal to ¹⁄₁₀₀ pound

:  a coin representing one penny

:  denarius