I agree, in my state PRN positions are plentiful and pay well, and if you are going to go this route, you should sign up with several companies. PRN is also nice because it seems you don't get caught up in all the department or facility politics -- you just show up to work and go home! That said, it can be a little stressful juggling your schedule, but as a PRN staff, YOU decide when and where you will work. Of course if you take time off, you have no vacation, sick or PTO pay.
I currently have a 32 hour+ job and a PRN job. Works great for me.