In early 2013, our web design studio in Sydney, started using a new e-commerce platform for Joomla! called MijoShop. It is actually a port of OpenCart that works inside of Joomla! so that you can take advantage of Joomla's templating system and other great features but have the great setup and control of OpenCart powering the e-commerce side of things.
This platform combination allowed us to finally build some powerful e-commerce sites that were all controlled by Joomla!
Our previous option to us was VirtueMart but development for that has stalled for the moment at the Joomla 2.5 platform and it doesn't look like there was going to be upgrade options for Joomla 3 for a long time.
We, as a design studio providing solutions for our clients, wanted to move forward with web trends and technologies to provide the best solutions possible and MijoShop was going to and has done that for us.
To help others get started in using MijoShop, here is a list of some great templates / themes that a few template providers around the world have created for it.