Search google. Years ago I found a site that sold laser kits. Now all I can find are Class IV burning laser kits, and those suckers are expensive. Infinitely cooler than crappy 150mw lasers, mind you, but we're talking 1500 bucks or more.

Oh, and they weren't nearly as compact as that thing the guy's wielding on youtube. But you could still lug one around awkwardly, assuming it isn't too delicate.