That guy is smoking some really bad crack with that price.
Even if it was still shrink-wrapped I'd be surprised to see it go for more than $400.
I sold a bagged, complete, but opened one about 2 years ago for $265.
I paid less than 30% of that 10 years prior.
I haven't ever seen a boxed shrink-wrapped Enerjet Athena go for $650 let alone a Nike Smoke.
The ONLY difference in this kit and the plain Centuri one are the parts for the "working smoker" nose, 29mm mount, and Silk hemisphere parachute. All of those can be easily added to the Centuri kit.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !