Bobble-heads, those figures with heads that bob up and down and sideways, not yes or no like earlier nodders, are popular again. They were, and still are, given away at baseball games and other sporting events. They lost favor, but came back in 1999. Today there are bobble-heads that represent popular book characters, aliens, rock stars, even Sarah Palin. Most sell for about $20, but old and rare ones can bring thousands.