And those were a twist on the old infomercial trick: Get a second one absolutely free! (just pay a "small" shipping and handling fee that is as much as a second one)
https://en.wikipedia.org/wiki/K-tel
> K-tel was founded by Philip Kives,[4] a demonstration salesman from Oungre, Saskatchewan.[5][6] Kives had worked at a number of jobs as a young man, including selling cookware door-to-door and in a department store, and as a pitch-man on the Boardwalk in Atlantic City.