Some Web retailers have set up enormous call centers to deal with the problem.

RedEnvelope was not the only Web retailer to run out of popular items.

Indeed, Web retailers who have initiated catalog efforts say incremental production costs are minimal.

The process is even more complicated for Web retailers, he said, because the same items sell at different rates through the different channels.

But regardless, he urges Web retailers to take a look at the options for improving the search process.

Online consumers should also read the privacy policies of Web retailers to make sure they do not distribute personal information.

"I did some research and found plenty of Web retailers selling discount items, but none in the odd lot category," he said.

Or, they can select an item from far-flung Web retailers and post the item's address on the list.

For some Web retailers, financial belt-tightening may be hampering their operations.

Other technology vendors say they have also seen growing demand from Web retailers for active chat services.