In these days, the fourth version of AceShop comes on market. AceShop 4 combines Joomla with the famous open source shopping component, OpenCart, which includes all important functions and parameters, that are needed for a functional online shop. Multiple payment gateways or shipping methods are available as well as one page checkouts, advanced sales reports or necessary product reviews. You can get AceShop in 50+ languages, with SEO optimation and geolocation. The download of the light version, which works with Joomla 2.5 and Joomla 3.x, is free. It works also in the former version, Joomla 1.5.
J2 Store is a multilingual online shop extension for Joomla 2.5, which will be delivered in a free version with a easy to configurable administration of your products. You can set all product features, like price, tax, attributes while creating an product. The two commercial versions offer lots of more features and special online payment plugins for Paypal, Authorize.net, SagePay, Ogone and DIBS Payment. You can get special languages packages in spanish, bulgarian and dutch. The download is free, after registration on developers website.