You can buy TurboTax for 2014 at the following link.
http://turbotax.intuit.com/personal-taxes/past-years-products.jsp
TurboTax for 2010 is no longer available.
(If you see 2010 TurboTax offered for sale somewhere, don't buy it. It won't be the final version, and you will not be able to update it. Also, you will not be able to get the state program for it.)