I was told they are discontinued. You have to ask others or maybe an auction on EBay.com. But they came with the mcat prep home study from Gold Standard I ordered over the summer. The home study came with the science and verbal booklet. Please visit mcat-prep.com, look in their books section for the practice items, or call direct at the number and see how much it will cost you. If it is too expensive, sometimes folks with their other mcat prep books will be selling them on EBay.
Best regards.