source for a type J (Energizer 539) battery holder

Email Energizer and ask them.

Well, I emailed Energizer and all I got were a few links to companies that made battery holders. I guess they figured I don't know about google. ;-)

I would think that their recommendations would be for acceptable quality holders.

I think the situation is the same as using PolaPulse batteries from back when they were popular: any holders are designed into the molded plastic housing that makes up a camera body.

That doesn't stop you from making a box out of G-10 or delrin or whatever, getting some raw spring contacts from Keystone or HH Smith or whatever your favorite hardware supplier is, and riveting/glueing one up yourself.

Tim.

Yes, I believe the only choice is to roll your own or use one from a commecial device. I am going to check one of the local surplus shops and see if there is some device I can raid.

Well, you are not correct here. They had no direct advice (i.e. use a blah blah blah), nor did their links contain any solution.

The fact that they didn't give any recommendations doesn't make my statment wrong. It just makes it harder for you to try. ;-)