Canonical has recently announced Ubuntu for phones, which is Ubuntu with a specific interface for mobile devices.
Where can I get phones with this version of Ubuntu pre-installed? If no devices are available yet, where can I pre-order one?
As of writing, no 'Ubuntu for phones' devices have been announced. Presumably, Canonical is still working with their partners to deliver some.
If you're interested, why not register to be notified by email as soon as one is announced?
Update February 2013: According to a Wall Street Journal article, Ubuntu-powered smartphones will become available as soon as October 2013. Presumably, this is referencing Ubuntu for phones, and not Ubuntu for Android.