Project Management Knowledge Assessment for PMBOK Guide 4th Edition from PMI

If you had been looking for some good sample exams for your PMP exam, you might want to consider the official Project Management Knowledge Assessment based on the PMBOK Guide 4th Edition from PMI. It costs $35. Here's the link:

Project Management Knowledge Assessment (based on PMBOK Guide 4th Edition) from PMI

I haven't tried the exam myself and cannot comment on its quality or the appropriateness for the PMP exam. If you have tried this exam, I request you to post your feedback and help others.