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Originally Posted by Pete Burton
Another option is to go to a site like http://www.epatest.com and do it legally. You can download the training document for free, then take the online, open book test for only $15 or $20. Plus, you'll learn quite a bit just by reading the information and feel better knowing more about how your system works and confident that you will be working safely, I know I did. Boy, what a great country we live in, with the choices we have! 
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I've read half of the material there, it's actually semi interesting. And for the $20 to not be hassled when purchasing as much R12 as you need, it's WELL worth it.