eBay with ShopHDE has a 2-Pack of 5mW Red Laser Pointers for $6.95 with free shipping. Features a 638nm wavelength and runs on 2 x AAA Batteries (not included). Great for presentations and exercising your cat.

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    Myself Ben's cred: 206
    Posted 4:42 pm PDT 07/17/13

    AA and AAA-powered lasers (of any color) are much cheaper to run than coin-cell versions. It's not so important for red, since they're so efficient in the first place, but still a good idea.

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