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These are very much like the old canning jars, dating from the 1960's and earlier - you can see them on ebay and Kijiji. They're something like these jars - http://www.antiquebottles.com/fruitja...
I have a large number of them that I picked up at yard sales. You may wish to consider doing that. Mine are in very good shape, are very sturdy, attractive and are in a wide range of sizes. You can still purchase the rubber rings in grocery stores. I prefer the rings. The disks are easier to work with but they can rust (and should be replaced after 1 use).
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