This tip was brought to be by a loyal reader and maker of the best basketball statistics software.
Sign up for Google Checkout, Google's online payment method, and link to a Citi credit card for payment. Buy something online by September and get a $10 statement credit.
While you can buy a $.99 Google Video and pocket $9, I went through Google Checkout's merchant list and took a $10 off promo for magazines subscriptions. So a $24 subscription will end up costing me $4.
Citi Bank sign offer link