Kurt Ballou recently posted about his business card, which inherently probably doesn't interest 99.9% of anyone ever, except it doubles as a distortion pedal schematic. According to Ballou, you'll need about $40 worth of parts and some knowledge on how to solder and assemble electronics, but you can absolutely do it.
Ballou posted a video of what the pedal sounds like below, and also says the card will be available in the Deathwish eStore sooner or later. So depending on your knowledge of electronics, this could be the cheapest and best distortion pedal you own!