The StroboPick is a tiny strobe light guitar tuning pic, designed to let you tune your guitar visually by shining red and green LEDs on the string until they line up. While strobe tuners have been around for a while, the StroboPick is considerably cheaper than conventional $200 models, ringing up for just $35. And if you've got pickin' and/or grinnin' on the brain, they also sell a banjo model for the same price.
While I think $35 is a reasonable price for such a product, it also looks like a perfect candidate for a homebrew kit. How about it, Strobotron?