Does anyone know if jon-e handwarmers are still made. I have a large size warmer and would like to use it for opening turkey season.I heard it's supposed to be cold and rainy for the first time period in Wisconsin.I hate being cold.What I 'm looking for it the fluid.I read on several web sites that Zippo lighter fluid can be used.I did a search on the web and did not see a jon-e manufacture web site.Mainly Ebay and Amazon and a few others offering advice,reviews and sales.I see that Cabela's has a Zippo brand handwarmer.According to the reviews,some like it,some don't.