Currently, one of my main project is about sending jpeg via RTTY (over Fm radio).
I order to keep low the price of the prototype, I'm looking for a micro webcam to capture images jpeg.
Finally I found one that is right for me!
808 Car Key Micro Camera ~10$
If you want to know more, go to this link: 808 Car Keys Micro Camera
Here some tips to make sure that the camera is recognized as a webcam.
I didn't checked if Rasbian contains gspca_spca1528 v4l2 kernel module yet!
I hope that it works on Raspberry-Pi :)