An online auction and shopping website in which people and businesses buy and sell a broad variety goods and services worldwide.  Ebay is currently the largest online auction web site.

Ubid

An online auction and shopping website that offers both goods sold directly by the company and items sold by pre-approved uBid Certified Merchants. It is currently the second largest online auction site by sales volume and is only available to US residents.

Overstock

Overstock is a multiple vocation web site that lets you hunt for the best deals in a real-time auction for the goods you need.