I am a big fan of the official ETS resources for Math and Verbal practice. They also give some good examples and advice for the writing in their Official Guide to the GRE. I don't remember if the ETS practice tests were in that book or another one, but those are also gold. I bought those things used on Ebay in good condition for a very reasonable price.
I paid the money for Magoosh somewhat impusively because of a Black Friday deal. Unless you are a person who needs a lot of structure, I felt that it was overpriced for something I could have done with much cheaper prep books. I am sure there are other people for whom it was worth it, but not me.
However, the free Magoosh smartphone app for vocab is AWESOME.
