The New Hampshire Office of Energy and Planning publishes a 19-month graph comparing the costs of different petroleum-based fuels.
A calculator is available from Penn State College of Agricultural Sciences to choose the more cost effective of any two heating fuels. You can enter a current price or accept the default values.
A table comparing the costs for 13 different “clean energy” sources to generate one Megawatt Hour of electricity omits coal and nuclear power, but adds a useful discussion of how costs for the various sources will vary by region. (The table is for California.)
The U.S. Department of Energy makes available a comprehensive set of energy calculators for buildings, homes, industry and vehicles.