What are some alternatives?
PayKickstart - PayKickstart is the ultimate shopping cart and affiliate management platform, empowering online Entrepreneurs and digital publishers with the tools to sell their products online.
Selz - Seriously Simple Selling
Shopio - Shopio is an all-in-one hosted shopping cart solution.
Plasso Storefront - Accept payments and sell anything from anywhere.
OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.
Allomani - Allomani is an E-Store with the shopping cart for online shopping websites, hosting & designing, Paid services, etc.