First, it would have helped if you had given us an idea of where you want to go to school or where you are currently located. Do you want to update your profile to at least identify the state?
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Lacking specific location information, try the following website:
www.Careeronestop.Org/Wiaprovidersearch.asp
This will allow you to look up Workforce Investment Act (WIA) training providers. This is a pretty good starting place.
Another source of information is
www.Refrigeratedtrans.com This is a magazine website that has several pdf files that you can download with some very interesting information on training programs divided up by states.
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If you are willing to relocate, states like Mississippi, Tennessee, Texas and Oklahoma have inexpensive courses.