Hey Garrett, 
Check the PX.  I think I saw they are carrying the G2 Nitrolon in stock for like $25 or so.  It has the tailcap switch you are looking for.  I am down in the "Impact Zone" in Baghdad.  I'll say I'd rather be here than Fallujah.  I hate that area.  I have to go to Tikrit and then Taji over the next two months.  
All I have is a Dorcy 1 Watt Luxeon head lamp, a pair of 3 LED wind up flashlights, an Innova red LED on my Badge holder around my neck, and a 3 LED back up 2AA palm light.  I had a Surefire L2, but gave it to another soldier because I didn't need anything that bright and I think he did.  You won't find an L2 for less than $100 I think.
Stay frosty up there.  The BGs are everywhere.   
_________________________
The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)