Laser accessory for speakers?

Question

When I was over at a house I saw this laser that shined up on the ceiling of the house and moved to the beat of the music that was playing from a computer speaker. What are these called and where can I get one from?

Answer 1

Edmund Scientific. It's called the Red Hot Laser Light Show. And it's only $25.

http://scientificsonline.com/product.asp_Q_pn_E_3085020