www.wickedlasers.com
Some of you may have seen these before. This company sells all kinds of lasers of varying power. They sell the lowest level ones ($99-$200) that are green ones with visible beams, the advanced ($200-$260) can burn holes in black garbage bags, the extreme ($300-$500) can pop dark balloons, and the spyder ($500-$1000) can light matches and cigarettes.
To be honest, I'm considering an advanced, since they're fairly reasonable for the price, and can be seen across town. Just don't use them around mirrors or anything, since they'll blind you like nobody's business.