Sam's Club carries Exide orbital batteries with even more cranking amps than Optima. See these links:
http://popularmechanics.com/automoti...ry/print.phtml
http://www.rockcrawler.com/features/...12000exide.htm
http://www.rockcrawler.com/techreports/exide_orbital/
http://www.exideworld.com/products/trans/na/truck.html