Tendelux IR illuminators seem popular on this page, but I've never tried one. You can get them off amazon.
The laser IR is on this camera:
I believe that's a rebranded Hikvision DS-2DF8236I5X-AELW. Appears to be about a $2500 camera, but I found it new for $800 on ebay. They had 6 available but took it down like the day after mine shipped for a "listing error" and it showed back up a few days later for $1500 or $1600. So I got a crazy good deal on mine. If I needed another one, I'd pay the $1500 for it too. Makes all my Dahua PTZs look like toys.
Anyways, I don't know that you can get just a laser IR illuminator. I haven't seen any with a 500m range either. If you really need to see far away at night and can't add remote IR to where you need to watch, save up for a real ptz with laser IR. Seriously, the difference is unbelievable.