A greater number of websites have some degree of e-commerce implemented within them.  From just selling a few items to a full blown shopping cart (see IXXO Cart below for example) you can have what you require.

IXXO Cart

IXXO Cart is an extremely powerful shopping cart application. Designed from a marketing perspective, it is feature-packed, robust, scalable and easy to use.  Many users consider it the clear choice for those serious merchants focused on rapidly and effectively deploying, managing and then growing a successful web-based business. IXXO Cart ecommerce package can be customized for most payment gateways and will track and report these transactions for your records.  It is not free (unsurprisingly!) and at the moment of writing costs $850 per year, then $170 each year if you want to continue to have access to all upgrades and support.  If you do intend to have a full-blown e-commerce website, don't think to go for anything less than a business hosting package too!