Farnell has a few versions of the Octal plug boxes. (Orange catalog page
46.)
Ranging from about 4-8 US Dollars.

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Subject: Re: [ot] little boxes with octal plug?
Author:  Harrison Cooper [SMTP:hcooper@ES.COM]  at IMS
Date:    8/13/98 1:34 PM


                I had some samples from I believe Potter & Brumfield
(now owned by Siemans??), that were basically KRPA type relay housings,
with the octal plugs on the bottom, and clear plastic case over the top.
It was a few years ago when I got them, so I don't know if they still
carry them as a catalog item