I rented one from John Shorter, in NYC. Reasonable and he will ship to you.
However, that being said, you could probably create something out of parts - a box, some gadgets, silver spray paint ala a little kid's robot Halloween costume. As long as you do it right, it'll turn out ok!
Good luck!
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Amber Hugus
Harmony PA
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Original Message:
Sent: 10-17-2018 10:50
From: David Weiss
Subject: Fester Rocket Pack
I'm in the Los Angeles area looking for Fester's Rocket Pack for The Addams Family Musical.
Help!