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Re:​72 Hours of Pwnage: A Paranoid N00b Goes to Def Con by busterarm on Friday August 19, 2016 @09:05AM (#12319674)
At a convention you can pay cash (semi-)anonymously where if you had to build that stuff you'd leave a paper trail.

Many I know in this group of people (DefCon/HOPE attendees) do things like trade around craigslist-cash-purchased laptops.

Re:​72 Hours of Pwnage: A Paranoid N00b Goes to Def Con by dublinben on Friday August 19, 2016 @11:41AM (#12320826)
It would also be a good place to anonymously buy Bitcoin for cash.