You might try contacting someone in the Cooks' Guild of the SCA. I'm sure they know about that sort of stuff. (www.eastkingdom.com?--something like that--Google East Kingdom of SCA)

The baby food jars won't work--can't reseal them. Bummer! We wondered what to do with all the ones we generated. We ended up just recycling them--you can only put so many buttons in jars.

Good luck with your efforts.
M