Any cheap camera will do what you want. The only caveat is your imposition of obtaining true colors automatically. Personally, I do not really see how that is important, because even if you post photos with accurate color, the person looking at the photos needs to have a monitor that is calibrated for accurate color. Regardless, a light box, a few lights, a tripod, and a camera will give you the results you want. You can buy all that stuff on eBay, or you can make a light box: http://youtu.be/--wO67tpj8I
I need an inexpensive digital to do nothing but photograph camera equipment I put on eBay. Of utmost importance is obtaining true colors automatically or with white balance control. The display needs to show an accurate representation of the recorded image. I need either stabilization or remote control or timer. I usually photograph components (bodies, lenses, accessories) from an inch to a foot across so I need good sharp focus over a reasonable zoom range and lens to subject range. I prefer to work with longer subject distances and greater focal lengths to allow room for better lighting.
Does anything in particular come to mind?