I have wanted to have a low-cost imaging chip, similar to what's in a web cam   
   or CCTV type camera, that is available to the experimenter. There are many   
   biomedical cell measurements that are best done with an image. For example,   
   stains selectively    
   migrate to certain cells which stand out under the microscope, but a bulk   
   spectrometric measurement would not show. This is also true in astronomy,   
   obviously.   
      
   So I have been looking around for CCD chips, and expected to find many on the   
   surplus market, but no luck.   
      
   Does anyone have any sources of these arrays, either B&W or RGB? I haven't   
   searched really thoroughly, just was surprised at the scarcity.   
      
   Thanks in advance,   
      
   JB   
      
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