If a seller lists any of them, Half.com will notify me via e-mail.

Getmein is a ticket exchange site that allows sellers to list the tickets at whatever price they choose.

For a 2 percent commission, sellers list their homes on a Web site, www.blueedge.com, and receive help with pricing and closing.

Her latest innovation is the Crowded Closet Newsletter, in which sellers list their items for a $10 fee.

And if sellers are listing lodging, they must prove they own the property or have a time-share membership.

On that page, sellers can list their own item as a "Sell Order."

Be wary if you see that a seller has listed dozens of identical items.

The seller had listed the apartments "three or four years ago," said Mr. Zabatta, for a figure close to $400,000.

The Giants do not allow sellers to list their seats below a minimum price, in order to prevent undercutting their own box office.

So I decided to check out the site's new stores where sellers can list merchandise for fixed prices.