I'm quoting your question here, so that others with similar question may take advantage.
Where can I get the 8 series? Is it a set of books?
check this site:http://www.amazon.com/gp/product/098417 ... S2VGSAXBGH
These are a series consisting of 8 books by Manhattan: 5 quant and 3 verbal. Note that you can access the CATs by buying even ONE of them. NO NEED to buy all.
Also, you can get access to CATs by buying Offical Guide Companion. Buying the Kindle version minimizes the costs: http://www.amazon.com/Official-Guide-Co ... 698&sr=1-1Manhattan is generous
. Source: my own experience with it
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