Turbotax recently hired Ebates to promotes their sales by offering an 10% off coupon. This can be used on any of the TurboTax packages (even the cheapest one).
In addition, Ebates is giving an additional $10 when you sign up (it's free and they don't ask for any personal info...so it's 100% safe)
You can find the Ebates link on My Ebay page (Ebay doesn't allow you to put direct links in Guides) --> My Ebay Page for the Link to Ebates
Hope you find this as helpful as I did!!