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If he is going to do it a business then he needs to get lined up with an electrical rebuilder supplier. Generally they will be wholesale only so he would need to be a business to order from them.http://www.arrowheadep.com/
Here is a place that I have used to find less common items that I need.
Ag Electrical Specialists
202 E Main, Racine, MN 55967, (507) 378-2101