As of April, 2015, people can buy Microsoft Word 2010 from Walmart.com. People looking for the full Office 2010 suite can download a copy and license from DirectDeals.com and Software King.
It's important to note that Microsoft only offers support for their products for a limited amount of time. Main support for Microsoft Word 2010 ends in October 2015, while extended support runs through October 2020. In addition to bug fixes, this support also patches potential security holes. Because Microsoft Office products are so popular, they're common targets for people looking to gain access to information on a computer and the computer itself.