Very easy to use Simple WordPress ParsPal Shopping Cart Plugin. Great for selling products online in one click from your WordPress site.
Simple ParsPal Shopping Cart allows you to add an 'Add to Cart' button on any posts or pages and your customers can pay product price with parspal service. It also allows you to add/display the shopping cart on any post or page or sidebar easily. The shopping cart shows the user what they currently have in the cart and allows them to remove the items. It can be easily integrated with the NextGen Photo Gallery plugin too.