Question: how much does it cost to build a guitar pedal?
Answer: DON'T BE SIMPLISTIC Numbers vary but $15 dollars seems to be a pretty common estimate on blogs and forums I've read. Then add labor and you shouldn't have to pay more than $45 (and probably less) for your favorite overdrive pedal, or so goes the thinking of the DiY'er who is building pedals from kits on his own time.