Since this is a Microsoft forum, I presume that your question is a typo and you actually meant to write "Surface".
You can buy it from the Microsoft online store or other providers:
http://www.microsoft.com/surface/en-us/buy
If you find any trouble with this, you should address your query directly to the Store or to a general end-user support forum, because this is not an adequate question for this Training and Certification forum, which is unrelated to the topic.