Yo Wiz,
GEEEEEEEZ things like this make me feel OLD!!!! Quit that!
Ideal made them, never bought one, they used to actually put them in boxes of Romex. I've got one somewhere in my shop, I will try to locate it and take a pic for you this weekend if someone doesn't beat me to it.
I swear I thought I saw one at Homey de-pot, try there, but watch your toolbox if the thread on this forum was correct