I did want to point out though, that this is definitely NOT the same as the ThinkGeek laser. Blu-Ray/HD-DVD uses a 405nm solid state (diode) laser module, which is fairly cheap to produce and work with. You can pretty much just give it the correct current, mount it in something, and you're off to the races. The color you get is in the near-UV range, which means is shows up as a purplish color (think black light) and fluoresces stuff like crazy. A UV filter would probably be quite detrimental to the performance of this laser, as a lot of the burning power is in the invisible UV light emitted.

As for the think geek laser, it uses a much more delicate/costly DPSS setup, where a high powered infrared diode is pumped through one or more KTP crystals, reducing the wavelenth of the light so that it is in the visible spectrum. True "blue" lasers emit at the 473nm wavelength and produce a rich, pure blue color. Because of the higher power, exotic crystal material, and precise alignment required for this to take place, DPSS modules are far more costly. Green lasers (532nm) also use the DPSS setup, but they have slowly dropped in price to the point where they are quite affordable.

That being said, Think Geek generally charges quite a premium for their lasers, and you can get much better deals from a vendor who specializes in them (for example, this same laser is around $200 cheaper at laserglow.com, and you'll be dealing with people who do this for a living)

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