As a user of A9.com I received credit titled "Est.A9 π/2% Instant Reward :" on an Amazon order today – that is a 1.57% discount.

To see your credit look below total the Order Summary when you are in the final steps of ordering.

If anyone cares here are the details:
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Iolaire McFadden, since you've been using A9.com recently, virtually everything at Amazon.com is automatically an additional π/2% (1.57%) off for you. Collecting this discount is zero effort on your part. It will be applied automatically at checkout (it will happen whether you use the shopping cart or our 1-Click Shopping®). You don't need to do anything to get this discount except keep using A9.com as your regular search engine.

We don't advertise this additional discount that we give in exchange for using A9.com, so if you want your friends to know about it, please tell them. It is probably the only way they'll find out. All they have to do is use A9.com as their regular search engine. They should make sure they are signed in to A9.com (it should be recognizing them by name) so that we can be certain they get credit for their visit.

While the π/2% discount is a good additional reason to use A9.com it isn't the best reason. A9.com licenses its web search results from the industry leader Google, and then supplements those results with Amazon's Search Inside the Book™ results. The coolest feature is that A9.com keeps track of your search history for you on the server side. To see how this works, do some A9 searches from your computer at work and then sign in to A9.com from your computer at home.

How can we afford this additional π/2% discount?

Sponsored links revenue -from the small text-based ads on A9.com and Amazon.com search results pages -will help offset costs we incur through the Rewards promotion. With our automatic π/2% discount, we are effectively sharing with you some of the money we collect from sponsored links, i.e. sharing the pi.

Please use A9.com and tell your friends.

Thank you

  

A9.com Instant Rewards will not be applied to the purchase of gift certificates or gift cards, such as Amazon.com Gift Certificates, Target GiftCards, or Borders Gift Cards.
A9.com Instant Rewards will not be applied to purchases from Amazon.com zShops or Amazon.com Auctions; payments and contributions made using the Amazon.com Honor System; Marketplace Pre-Orders; or In-Store Pickup purchases.
A9.com Instant Rewards may be inactivated for any Amazon.com account at any time depending on the number of A9.com Web searches performed.
Product searches performed on Amazon.com will not help to qualify an account for A9.com Instant Rewards.
You do not have to click on sponsored links to qualify an account for A9.com Instant Rewards.
The A9.com Instant Reward rate is π/2% (1.57%) off the total purchase price, including tax and shipping.
The exact amount of the A9.com Instant Reward stated on the order summary is only an estimate. After taxes are finalized, the exact amount of the Instant Reward will be finalized.
A9.com Instant Rewards are not for use on Amazon.co.uk, Amazon.de, Amazon.co.jp, Amazon.ca, Amazon.fr, or any Web site other than www.amazon.com.
Amazon.com reserves the right to change or discontinue the A9.com Instant Reward program at any time.

Sorry the π/2% should read, pie symbol/2%