Crimson trace makes one for about $100. It gets good reviews and is a laser/light combo. Just remember, adding something to the rail almost always eliminates your ability to carry in a good holster. At the very least you will be very limited in your holster choices.
Ah ha! Thanks! From Amazon I checked back with the crimson trace site. They have the rail masters too but the site is not helpful in getting you to applications for guns they don't build specifically for. Now I just need to lay down some thick hints with my son- in-law!No, no, you are looking for rail mounted, yes? Amazon.com. Look for the crimson trace rail master.