Hi All   
      
   I was hoping someone might be able to help me. I plan to build a simple   
   interferometer, for which I require some 90 degree hollow roof prism mirrors    
   (or alternative roof mirrors) with roughly +- 10 arcsec dihedral angle   
   accuracy. I have checked the    
   usual scientific suppliers (Thorlabs etc) but costs are more than $300 for a   
   one-inch-square component, which is unfortunately too much for this particular   
   project. Is anyone able to recommend a more economic option? Ideally, I am   
   looking for a cost of <    
   $100 per roof mirror. Are they by chance a standard component in any existing   
   mass-produced products?   
      
   Many thanks!   
      
   John   
      
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