I got 12 Rayovac CR 123As for around $16. Since they make Surefire batteries I'm pretty confident. Now granted, Surefire may have tighter specs, so they might not be the same, but I'm willing to take a risk. They have Duracells, 12 batteries for $20ish, and that beats the hell out of Radio Shack or Gander Mountain prices.
FQ13