Evidently, sure fire quit making the cheap g2 nytrolon led light. For the price I'd get a Sreamlight TLR1. The g2 led I have were only $60 and my suggestion was intended for a bargain priced light.
The mount I use is a Viking Tactics mount that runs about $25.
It's called the G2X now. 200 lumens instead of the 170 (I think) of the plain G2. Other than that, it's the same. Well, except price. The X is around $90. But I have done a few google searches in the last couple months and you can still find new in box G2s. Just have to search. And they're cheaper now. Think I saw one for $45.
