End-users are no longer required to buy Office 2010 media. If you have an product key card, you can download Office 2010 from the website, free of charge:

http://www.office.com/productkeycard

For OEM manufacturers, direct link to the Office 2010 pre-installation kit. Unlike 2007, this release is also available for download free of charge:

http://oem.microsoft.com/script/contentpage.aspx?PageID=566219