I know that Canonical will produce Ubuntu tablets, and I'd buy one, but I don't know how much would it cost and where will I find it.
closed as not constructive by Eric Carvalho, user68186, aquaherd, belacqua, Basharat Sial May 29 '13 at 18:26
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Here is a link provided on the Tablet page of www.ubuntu.com that will allow you to sign up for a notification about updates to the Ubuntu Tablet: http://www.ubuntu.com/tablet/register
If you cannot wait until an unspecified date, you could modify a Nexus 7 (or Nexus 10) which would cost $199 or greater. https://wiki.ubuntu.com/Nexus7/Installation
*Note this installation is a preview, not what the final OS will be. There is more information on the Developer Preview. Expect bugs.