I didn't realize those palm programs required money! 😉
Seriously, most students share palm programs like they way they share their shelf exam books (I gave my Neurology stuff to my buds in exchange for their Family stuff). Ask your buddies or your residents if you can have a copy of their programs. Don't know if it's legal or not, but that's how most people get their programs.
I don't use a PDA. I find a pocket book is much faster and allows me to make annotations. But then again, I don't get to play Dope Wars during Grand Rounds.