I think I may get one of these when they become available, and the price seems to be fair.
http://www.engadget.com/2010/04/26/wowee-one-portable-speaker-latches-onto-surfaces-ipads-coattai/
http://www.engadget.com/2010/04/26/wowee-one-portable-speaker-latches-onto-surfaces-ipads-coattai/