We offer you at no Extra Charge.
You can find them in your cPanel under the Fantastico De Luxe. You will also find more information on this in the cPanel. These are third party software. Support for setting them up is provided from us. However, you can discover more details on vendors web site.
For Cubecart - http://www.cubecart.com/
for OS Commerce - http://oscommerce.com/
You are also free to install your own Shopping Carts on your site.