Night Vision Best IR Illuminator for the $$

A used Surefire V series is probably going to be the best you're going to get under $200 and not be a complete piece of crap. There's a few that will do 300 yards, I know the M952V and M720V will. You can find the M952V used under $200 pretty easily. The M720V aren't quite as common and I doubt you're going to get one in your price range.