Light-Weight Copy Stand
This is the least expensive option we know of.

We haven't tried this one yet but it looks like it can do the job. The base board is 18 by 12 inches but the column is only 18 inches tall. That should be good for light-weight cameras with wide angle lenses like a web cam. Just tape a peg bar to the base and start shooting.  B&H Photo doesn't carry this one but you can get it at Bug Eye Digital for about $60.

Heavy Duty Copy Stand
This one is really nice.

This is a very sturdy, high quality copy stand. It's available with or without the light fixtures. The fixtures work with standard incandescent light bulbs and the florescent light bulbs that you can screw in. We recommend using two Circuline florescent bulbs by Lights of America, available at Wal-Mart and Home Depot. They are much cooler and provide relatively even lighting across the image area The base is 15.5" X 16.5" and the geared column is 27.5" tall. This copy stand is about $200 without lights or $335 with lights at B&H Photo.