Here is an awesome argon ion laser that I bought off of a forum. (thanks Pontiacg5!) This laser outputs 8 different colors! 

This laser is absolutely huge! It is also extremely inefficient, after running for a few minutes, it heats up the whole room.

Check out http://laserpointerforums.com to learn more about laser pointers, lasers, and laser pointer companies! I have been a member there for 8 years, and have received a bunch of help from the knowledgeable members there!