Oh yeah, I forgot about that:
number2.com is a good starting resource. the tests are easier than the real thing, but they show you where you make mistakes, you learn tricks and it's free.
Also, sparknotes has a free GRE guide online. ETS has a math review guide. Also great starting point. If you have the time, start from there, and then look for a book that will help you go over 1200.