The Denver April 12, 2010, PBS Antiques Roadshow reported on a medium sized copper tonal, originally bought for $500 in the 1970s, now worth $15,000 to $20,000. Very cool.
The Raleigh January 4, 2010, Antiques Roadshow featured a beautiful Bertoia spray, bought at an estate sale for $10, currently valued at $10,000. Not bad.
Check it out: http://www.pbs.org/wgbh/roadshow/archive/200902A35.html