Web Site that sells stuff

I am doing an assignment on a web site that sells goods.  I need a
site with nice people that would be able to tell me stuff about their
business.  I have tried Amazon and they said go away, and I can't
really find contact information on ebay.

I need to know what issues you would need to consider when designing a
web page.  Like the scope of the site, periodic data collected,
occasional data collected and reports generated.

What sites would be applicable?  Who would be nice enough to give me
information?

Thanks alot guys and girls