answer:
Central Pennsylvanians
to Abolish the Death Penalty states: "No comprehensive study has been done to examine
the cost of the death penalty in Pennsylvania. In states where such studies
have been conducted, capital punishment is always more expensive than
even life without parole. A report in New Jersey in 2005 found that the state
had spent $250 million for a death penalty institution that had produced no
executions and just 10 death row prisoners."
The Death Penalty Information Center lists studies from other states. See DPIC's Contact page for information on its directors and organization.