This may be old news, but since many people have recommended on various threads here, Taking Charge of your Fertility by Weschler, I was looking into buying it. I found it and wanted to let know that you can find it used on Amazon and Barnes and Noble for very cheap.
I just ordered it on Amazon for a penny! Plus $3.99 shipping, that's just $4 for this book. It is not the newest edition, but being on the very tight budget I'm on right now, I'm sure it's still useful.
Just wanted to let others know. There have been a few NFP related threads lately, and I have seen this book recommended here many times. So if you're trying to learn NFP and you're on a tight budget like me you can get the book pretty cheaply.
Happy online book shopping!