It looks like fake site offering you to refister your credit card before knowing any facts. I'd keep away regardless weather I'd find out the subscription cost or not.
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The Bluebook is a subscription based service, that has a monthly or yearly cost of $9.99 or $99.99 respectively. Non-subscribers can use it for everything other than pricing info, such as the review and search links. One time look ups are available for $4.99 from the product page. Subscribers receive access to the full data such as the pricing graphs.