Sony Quanum Hobbyking camera box 38mm
The Quanum FPV kit from hobbyking.com has a decent camera in it. Stock lens of 3.6mm should be replaced with 2.8 or 2.6mm for a wider field of view.
http://www.banggood.com/2_8mm-Focus-700TVL-95Degree-Camera-Lens-for-QAV250-Quadcopter-FPV-p-944065.html
This camera holder pairs with 1.5 inch (38.1mm) standoffs & the Emax nighthawk 250 frame.