Got a few things there . https://www.bhphotovideo.com/
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This is just one reason AMZN is as valuable as it is.
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Edmund Optics?
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About $120 for a 3-in dia AR-coated BK-7 plano-convexhttps://www.edmundoptics.com/c/optical-lenses/603/#27614=27614_d%3A%5B70.00%20TO%2080.00%5D&Categories=Categories%3ANjU20 …
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damn thats pricey, could buy a full cheap telescope at that price :(
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Not sure if this will help https://www.wired.com/2012/04/top-10-places-to-find-diy-supplies/amp … Also, Google DIY science project/maker supplies
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Maybe McMaster-Carr?
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Grind your own! Lenses actually benefit from pseudorandom manual grinding movements
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Looked into it, too gritty for me
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