There are a few I used...Kaplan makes a great GRE prep book that contains all components of the GRE (Analytical writing, Verbal and Quant). Its basically what you will learn in $1000 course! Kaplan also makes a small "GRE flashcard/book" with like 500 vocab words...It defines the word, uses it in a sentance, and gives you some synonyms...I highly recommend using it, b/c when I took the GRE (I've taken it 2x's), I was able to recognize @ 80% of the vocabulary words (VERY HELPFUL)...Another great tool, is a CD-ROM which comes in the back of the Barron's GRE 2006-2007 book...It has a scored diagnostic test, and many timed practice exam questions. The format is identical to that of the GRE CAT you will be taking... Good Luck!!