There aren't many logic-level p-types to choose from. Supertex has a few. Spehro Pefhany suggested the IRF7425, which has 13 mill-ohms Rds(on) (max) at -2.5V, 8.5 mill-ohms at 4.5 volts. It's in an SO-8 package, about 85 cents US in 100's.
What are you looking for?