It is possible to buy Lightroom, but Adobe make it as difficult as possible, as they want you to rent. After about 5 minutes I found this link on the UK site, and I assume there's something similar in other countries: http://www.adobe.com/uk/products/catalog/software._sl_id-contentfilter_sl_catalog_sl_softw are_sl_mostpopular_uk.html. If you go to that page, you should be able to change the region (link at the bottom).
PS - a meaningful title to your thread would be good! We know your post is probably about Lightroom, as this is a Lightroom forum.