What is the plugin for setup wordpress online store?

Im on my way setting up wordpress online store, any idea which plugin is free and secure to use? Any idea? Please help. Thanks

 

You can try wp e-commerce and eShop wp plugin
I think both the simplest online store plugin

 

e-commerce is good. try that. download here:http://wordpress.org/extend/plugins/wp-e-commerce/

 

However, Datafeedr Wordpress Store should be paid monthly, I think it worth it as you can easily add products from 19 affiliate networks and choose from 130 million products. You can easily set up your store with hundreds of products.
More info and video: scriptech.net/Affiliate-Store-Wordpress-Affiliate Marketers