You might have to do some drilling down but the manufacturers of the most common commercial refrigerants usually have property tables available on their web sites. Dupont.com, for example, has P-T tables or diagrams for all of their SUVA brand refrigerants, and also enthalpy charts. FMC has some good ones too.
Happy Hunting! (Unless somebody posts some direct links...)
Copeland is a manufacturer of compressors. They offer free software called 'Pathfinder'. It offers complete and detailed refrigeration properties for a number of types of refrigerants. I don't have their websit handy.
