Hmmm ...

There is a link on the GoDaddy page for Buy.com $0.99 deal.
Register or transfer any available .COM, .US, .MOBI, .BIZ, .NET, .ORG, .CA, .CO.UK and .IN domain for just $0.99!*
Applies to the first year only of new or transfer registrations. This offer may not be used for renewals, bulk registrations, premium domains or Sunrise/Landrush domain registrations. Limited to one order per customer, expiring after 7,500 redemptions or on December 29, 2009 (whichever comes first). Discount will be reflected in your shopping cart; cannot be used in conjunction with any other offer or promotion. Customers may not use gift cards or PayPal® to redeem this offer.
* Plus ICANN fee of 18 cents per domain year when applicable.

Your discount will be applied in your shopping cart.
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Maybe 7500 purchases happened?