I know nothing about this, having never used one, so I'm not making a recommendation. But I thought some might be interested:
For only $28.56 each when QTY 50+ purchased - CaseDuo HDTV Media Dock for Samsung Galaxy SIII - Black
For only $28.56 each when QTY 50+ purchased - CaseDuo HDTV Media Dock for Samsung Galaxy SIII - Black