Prestashop Component for Joomla
Yes, there is a prestashop component for Joomla. Its new but stable. I am using it for the last two weeks and I am planning to switch all my customers from virtuemart to prestashop. Its lightyears ahead virtuemart.
The developer’s url is http://prestashop-joomla.com
If you would like to view their online demo you can take a look at