[Laser] Fresnel Lens

[jim car]

Hi everyone,
      I'm looking to build a fresnel lens receiver and was wondering if any of you could point me to a good source. I'm not looking for a top of the line lens, just one that will collect light and isn’t that expensive. Do any of you have suggestions? On terms of the size I'm looking for one that’s about the area of a page, 30x30cm or so a little larger is fine.
       Thanks!
          -Jimmy - KG4SGP
   

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