I am interested in utilizing the arduino to prototype a small digital camera with wifi. I would not need a screen tied in but I would like it to be very small and have the ability to use an IR light for night pictures. It would connect to an app I have built that would allow me to request a photo from the camera anytime. Any thoughts or recommendations on how to make this happen and specific tips on parts to purchase. I would also like to keep it relatively cheap as it is a prototype for a commercial product.
Based on the limited information you provided, you might be better using something like the RPi.
The model A+ is supposed to start at $20 (if you can find a supplier with that price).
There should be lots of articles on line about night-vision using IR.
This does not seem to have anything to do with Arduinox. Why would you imagine it does?
A "w-ifi enabled camera" is generally called an "IP Camera" - it is an off-the shelf item - and generally has IR capability. If you imagine you can build one cheaper, you are seriously deluded.