Hello
To recreate this module first set your Joomla editor to CodeMirror (Site -> Global Configuration). Create a Custom HTML module (Extensions -> Module Manager -> New -> Custom HTML) and add the following code..
<p class="j51-button" style="float:right;">
<a target="_blank" href="http://www.joomla51.com/joomla-templates/j51-clarity">Purchase Now</a>
</p>
Where
http://www.joomla51.com/joomla-templates/j51-clarit is your button URL and 'Purchase Now' is your button text. Edit to taste.
Ciarán