Current price in central/southern NJ is (direct from my bill) 0.3359 for 3rd party delivery and 0.659 for the gas. Multipy those by Therms used (Therms being the BTU content (1.056) multiplied by the 100's of cubic feet used)
Electric seems to be at 0.043143 per KWH from the local company JCP&L and 0.05878571 from FirstEnergy (the deregulation mandated cram it down our unsuspecting throats alternative supplier).