I'm not sure that "dancing robots" have enough functionality to be a long-lasting market segment unless they add a lot to their repertoire. I've listed this one, however, because there are replacements for all parts and it looks fun to build.
: : : HITEC ROBOTICS - PRODUCT OVERVIEW : : :: "Hitec Robotics is proud to announce ROBONOVA-I. This exciting new humanoid robot offers educators, students and robotic hobbyists a complete robot package. The stable ROBONOVA-I can walk, run, do flips, cartwheels, dance moves and once programmed, is ready to compete in any Robo One Class “J” competition. Available two ways, as a kit, so you can enjoy building your robot yourself, or as a pre-assembled, “RTW”, “ready to walk” instant gratification robot."