Lots of good chargers for under $100. [link=http://www.ehirobo.com/shop/product_info.php?cPath=134_138&products_id=5452]Here[/link] is a good one and [link=http://www.ehirobo.com/shop/product_info.php?cPath=134_138&products_id=5453]here[/link] is another. Both will require a DC adapter like a laptop charger. The ones i quoted are a company in Hong Kong that i have used before, im sure you will find a company in the USA if you look.