Unfortunately I'm not quite ready to part with my study guide yet, I still need to do some reviewing, but I would highly reccomend a trip to your local public library if that is an option for you. Not only do they have plenty of study guides available but if you look under the call numbers 359.5 and 359.9, there's some good general navy stuff there as well.
If you can spare a few dollars but not enough for a new book, check out both amazon.com and half.com, you can usually pick up used books of all kinds for well under half price.
I hoped this helped and good luck!
~Eric