Your price on the K-41 Mercury Redstone would be right-on if sealed and pristine.
Not on an opened one with discolored wraps; that's a "builder" not a "collector" grade kit....maybe $65-70. Doubt you will get any bites at $100.

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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, TURMOIL, FIASCOS, and HAVOC !