Hobby Lobby has them for like $1.50. The jars, that is.
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Try this link for EFIE plans:
http://www.alt-nrg.org/efie.html
This is by Zero Fossil Fuels.
I was going to build my own but for around $55 you can buy one already made....I Figured it would take be 8+ hours to get the components, build it, etc so, decided to buy a ready made unit....
This is the one I bought:
http://cgi.ebay.com/ebaymotors/ws/eB...235417192&rd=1
Hope this helps!
Here is the best and cheapest one I've found. He even shows you how to make them yourself in a Youtube video if you'd like to go that route.
http://www.pwmpower.com/efie.html