I'm fairly certain it started around 4 years ago with Matt Clark's "Amazon Selling Machine." A friend who paid the $1000 let me watch the course and it was a pretty simple (and old) tactic.

Buy wholesale and sell at markup. Except this time you would have it under your own "private label" (i.e a Chinese factory would slap your logo on a generic and sell it to you).

Apparently he made a killing doing the same thing with silicone spatulas.