The rich kid in the neighborhood had a purple one. Some of the rest of us got our knock-offs 2-3 years later. By that time, the rich kid had moved on to be the "early adopter" of the next cool thing.
Anyway, mine was from Sears (like pretty much all my clothes and stuff).
It was an elongated Sting-Ray-like bike called The Rail. It was purple and had a 5-speed T-handle shifter on the top tube surrounded by a plastic "wood-grained" console.
I see a Huffy model of that same bike occasionally, but I rarely see the Sears version.
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WTB: Slingshot bicycle promotional documents (catalog, pamphlets, etc).
WTB: American Cycling May - Aug, Oct, Dec 1966.
WTB: Bicycle Guide issues 1984 (any); Jun 1987; Jul, Nov/Dec 1992; Apr 1994; 1996 -1998 (any)
WTB: Bike World issue Jun 1974.