These come up on ebay often enough, but, normally they are expensive...

Cheers

Rogers and Duplex fit....they're often a lot cheaper. I lucked into a Rogers and one that is unmarked, both of which I use with my gigging snares. My actual Camco one I keep safely away.

Regular Camco keys will fit and are cheaper, and probably will stay in the holder...but the correct key has a groove toward the business end of it that the ball bearing in the holder slips into and helps hold it into place. Those go for much more $. Some here will say, "what is the difference, this one works!" But there is a difference.

I'm one of them...

I ended up buying these. All three actually fit. One is a Rogers and the other two do not have any markings. Still wish I had an authentic Camco key, though.