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A comment on Show HN: A high-speed laser camera trigger for under $2. Parent comment

Re:Show HN: A high-speed laser camera trigger for under $2 by mcpherrinm on Friday July 18, 2014 @05:02PM (#8055614)
I'm sure I've bought laser pointers at Dollarama before (for $1 CAD) and those included batteries: Even if the total BOM is $3, it's still pretty cheap.
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