Shopping Carts can be as simple as working through PayPal or you can utilize feature laden interfaces for maximum control, with customer tracking, database driven inventory control and more.
Below, a basic PayPal system. PayPal can be utilized to provide many variables, such multiple shipping options, size selection, recurring payments and coupons.
Step up to systems that can work with a database, store customer data, insert and track special sales, collect membership, send out a newsletter, and more.
To see one of these stores in action, check out www.dunken.com