Any recommendations where I might finding something like this:

I'm looking to buy a 5 mW 532 nm laser. I'm planning on building a sort of laser light show.

Most of the lasers I find can only be on continuously for 15 minutes to a half hour. This is obviously not suitable for my purposes. I need something which can be on continuously for a few hours. I'm assuming something like this will need a heat sink of some sort. I'm also planning on hooking it up to an AC/DC adapter so I won't need batteries.

Does something like this exist? Where should I start looking?

Thanks

Hot Mini Laser DJ lighting Stage Party light Disco Show | eBay
if you want to go cheap and pre done.
if you want your own laser with psu and heatsink u may have to get that made for you or buy
60mW green laser point generator with fan laboratory | eBay
hmm ebay lost alot of lasers... there are other cheaper ones but that should get you looking.